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Letteratura scientifica selezionata sul tema "Double stars"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 31 luglio 2024

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Articoli di riviste sul tema "Double stars"

Vilkki, E. U. "New Double Stars". Publications of the Astronomical Society of the Pacific 100 (dicembre 1988): 1540. http://dx.doi.org/10.1086/132361.

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Xin-Lian, Luo, Bai Hua e Zhao Lei. "Double Degenerate Stars". Chinese Physics Letters 25, n. 7 (luglio 2008): 2378–81. http://dx.doi.org/10.1088/0256-307x/25/7/013.

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Urban, S. E., T. E. Corbin, G. L. Wycoff e B. D. Mason. "Problems of Using Hipparcos Astrometry of Double Stars". International Astronomical Union Colloquium 180 (marzo 2000): 97–103. http://dx.doi.org/10.1017/s0252921100000178.

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AbstractThe current optical realization of the International Celestial Reference System is the Hipparcos main catalog in its entirety. This paper demonstrates that a subset of the main catalog stars — specifically those marked as double (“C” stars), acceleration solution (“G”), variability induced movers (“V”), and stochastic solution stars (“X”) — is of much lower quality than the majority of the catalog. Stars marked as suspected doubles (“S”) were investigated and found to show few problems. The authors have put forth a resolution (Resolution 2, this conference) to remove the C, G, V, and X stars, in addition to the Hipparcos orbit stars (“O stars”), from the optical realization of the reference frame.

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Agati, Jean-Louis, Sébastien Caille, André Debackère, Pierre Durand, Florent Losse, René Manté, Florence Mauroy et al. "Activities and Achievements of the Double Star Committee of the Société Astronomique de France". Proceedings of the International Astronomical Union 2, S240 (agosto 2006): 509–26. http://dx.doi.org/10.1017/s174392130700645x.

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In a synthesis article (see ref. below), the double star expert Paul COUTEAU put the work of French pioneers of double stars observation in the perspective of the double star work carried in the world. After Antoine Yvon VILLARCEAU and Camille FLAMMARION, one prominent pioneer of double stars was Robert JONCKHEERE (1888–1974), an amateur before circumstances prompted him to become a professional astronomer, who devoted his life to double stars. Kenneth Glyn Jones wrote a biography and Charles Fehrenbach his obituary. Jean-Claude Thorel studied his life and career in double star observations (see Section 10 below). In the 1930s, another precursor of the Commission des Étoiles Doubles, Maurice DURUY (1894–1984) invented the micrometer with a comparison star, and applied the diffraction micrometer invented by Ejnar Hertzsprung to the measure of double stars, which he regularly observed at Nancy with a 275-mm telescope, at Lyon with a 162-mm telescope and in his observatory of Beaume-Mêle with a 40-cm and later a 60-cm telescope at Le Rouret (Alpes–Maritimes). He measured standard pairs of the list of Paul Muller and published his measures in the Journal des Observateurs; these measures requested by Paul Muller aimed at comparisons of between observers. He also collaborated with the Webb Society of Great Britain; Glyn Jones published his astronomical biography. Already in 1924, the pediatrician Paul BAIZE (1901–1995) had started the measurement of double stars as an amateur. He was granted permission to measure them with the 38-cm of the Paris Observatory and made an impressive number of measures during his long “career" (24044). He also made orbit calculations and established a formula for the calculation of dynamic parallaxes in 1946. He wrote articles explaining new observation techniques devoted to double stars in the magazine L'Astronomie and continued his astronomical activity until the beginning of the 1990s. Glyn Jones published an astronomical biography of Paul Baize. In the 1960s, Bernard CLOUET and the late Robert SAGOT (1910–2006) made double star observations for the book which was then in preparation under the title La revue des constellations. Their measures remained unpublished; but publication of the measures made by Robert SAGOT is in preparation. At about the same time, the neurology professor Jacques LE BEAU (1908–1998) made the acquaintance of renowned professional astronomer Paul COUTEAU and learned from him how to measure double stars. Each year, he stayed for two weeks at Nice and conducted his observations with the 50-cm refractor of the Nice Observatory. In 1978, Paul COUTEAU published the first book in French devoted to double stars: L'observation des étoiles doubles visuelles. That book triggered the interest of more amateur astronomers for double stars and indirectly influenced the creation of a group of double star observers which was transformed into the Commission des Étoiles Doubles

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Rezaei, Zeinab. "Double dark matter admixed neutron star". International Journal of Modern Physics D 27, n. 16 (dicembre 2018): 1950002. http://dx.doi.org/10.1142/s0218271819500020.

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The dark matter (DM) in neutron stars can exist from the lifetime of the progenitor or when captured by this compact object. The properties of DM that enter the neutron stars through each step could be different from each other. Here, we investigate the structure of neutron stars which are influenced by the DM in two processes. Applying a generalization of two-fluid formalism to three-fluid one and the equation-of-state from the rotational curves of galaxies, we explore the structure of double DM admixed neutron stars. The behavior of the neutron and DM portions for these stars is considered. In addition, the influence of the DM equations of state on the stars with different contributions of visible and DM are studied. The gravitational redshift of these stars in different cases of DM equations of state is investigated.

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Novakovic, B., e N. Todorovic. "Orbits of four double stars". Serbian Astronomical Journal, n. 172 (2006): 21–25. http://dx.doi.org/10.2298/saj0672021n.

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We present orbits of four double stars. Orbits of stars WDS 23516+4205 = ADS 17050 and WDS 18239+5848 = ADS 11336 were calculated for the first time. Orbits of double stars WDS 02022+3643 = ADS 1613 and WDS 18443+3940 = ADS 11635 were revised. We have also determined their masses, dynamical parallaxes and ephemerides.

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Zinnecker, H., C. Scarfe, C. Allen, T. Armstrong, W. Hartkopf, R. D. Mathieu, A. Tokovinin e M. Valtonen. "Commission 26: Double and Multiple Stars (Etoiles Doubles Et Multiples)". Transactions of the International Astronomical Union 24, n. 1 (2000): 186–89. http://dx.doi.org/10.1017/s0251107x00002856.

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This triennial report (1996-1999) reviews the subject from a somewhat personal angle, mostly related to binary star formation and young binary star populations – a subject whose time had come in the early 1990s and is now in full swing.Many astronomers have searched for binary systems among main-sequence stars, and two large-scale surveys published in 1991 and 1992 have already become classics. Well before they became famous for finding extrasolar planets (see below), observing teams led by Michel Mayor (Geneva Observatory) and Geoffrey Marcy (San Francisco State Univ., now Univ. of Calif, at Berkeley) spent many years searching for low-mass stellar companions of nearby stars. The late Antoine Duquennoy and Mayor surveyed all solar-type dwarfs (spectral types F7 through G9) within 20 pc of the Sun, while Debra Fischer and Marcy studied stars with somewhat lower mass (M dwarfs) slightly nearer to the Sun.

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Isobe, Syuzo, e Mikinori Ni-Ino. "Formation rate of triple stars relative to double stars". Astrophysics and Space Science 224, n. 1-2 (febbraio 1995): 491–92. http://dx.doi.org/10.1007/bf00667920.

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Zulevic, D. J., G. M. Popovic e R. Pavlovic. "Micrometer measurements of double stars". Serbian Astronomical Journal, n. 161 (2000): 25–31. http://dx.doi.org/10.2298/saj0061025z.

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A set of 71 measurements of double and multiple stars, carried out with the Large Zeiss Refractor 65/1055 cm of the Belgrade Observatory, is communicated. The bulk of these measurements, 41 in all, unpublished yet, is due to late D. Zulevic.

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Worley, Charles E., e Brian D. Mason. "Micrometer Measures of Double Stars". Astronomical Journal 116, n. 2 (agosto 1998): 917–30. http://dx.doi.org/10.1086/300475.

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Tesi sul tema "Double stars"

Komonjinda, Siramas. "A study of binary star orbits using precise radial velocity measurements with the HERCULES spectrograph". Thesis, University of Canterbury. Department of Physics and Astronomy, 2008. http://hdl.handle.net/10092/1590.

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Orbits of spectroscopic binary systems have been studied for more than a century. Over three thousand orbits of spectroscopic binary systems have been derived. These orbits are based on the radial velocities measured from the spectra recorded by a photographic plate to a high precision spectrum observed from a modern spectrograph. In many cases, the shape of the orbit was assumed to be circular, of hence the eccentricity is zero. This assumption is based on the fact that a small eccentricity (e < 0.1) measured from the observed data might be a result from the error of observations or from the intrinsic variation of a spectroscopic binary system. Sixteen southern spectroscopic binary systems, including twelve single-lined binaries and four double-lined binaries, were selected to study in this research program. These systems were assumed to have circular orbits or have very nearly circular orbits (e < 0.1) from their previous published solutions. The HERCULES spectrograph was used in conjunction with the 1-m McLellan telescope at Mt John University Observatory to collect the spectra of these systems. The observations, taken from October 2004 to August 2007, comprised about 2000 high-resolution spectra of spectroscopic binary systems and standard radial-velocity stars. Radial velocities of spectroscopic binary systems were measured from these spectra and orbital solutions of the systems were derived from these radial velocities. It was found that from HERCULES data, we are able to achieve high-precision orbital solutions of all the systems studied. The best-fit solutions can be improved as much as 70 times from the literature’s orbital solutions. It has been found that the precision of a system depends on the rotational velocities of the components as well as the level of their chromospheric activity. We are able to confirm the eccentricity in the orbit of only one of the selected spectroscopic binary systems, HD194215. Its eccentricity is 0.123 29 ± 0.000 78. The small eccentricities of other systems are not confirmed. There are four systems; HD22905, HD38099, HD85622 and HD197649, that have circular orbital solutions from the large errors in their measured eccentricities. Two systems, HD77258 and HD124425, have too small eccentricities, e = 0.000 85±0.000 19 and 0.002 60 ± 0.000 99 to be acceptable. An intrinsic variation is a presumed cause of the spurious eccentricities derived from the data of the other eight systems. Photometric data from Mt John University Observatory service photometry program, as well as the photometric data from the Hipparcos satellite and information of these systems from the literature, using various methods and instruments, give a wider view on the systems’ behaviour. It is possible that the spurious eccentricities derived for these systems result from the eclipsing behaviour of a system (HD50337), or from the nature of the components, such as, the distortion of their shape (HD352 and HD136905), their chromospheric activity (HD9053, HD3405, HD77137, HD101379 and HD155555), or stellar pulsation (HD30021). Models of the active chromosphere system, HD101379, have been simulated. An analysis of synthetic radial velocity data shows that spots on the star’s photosphere can cause a spurious eccentricity. The values of the spurious eccentricity and the longitude of periastron are dependent on the spot size, the spot temperature, and the position of the spots.

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Bascoul, Guillaume Pierre. "Double-diffusive convection in stars". Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613006.

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Bauer, Christina, of Western Sydney Nepean University e Faculty of Science and Technology. "Astrometric observations of wide southern double stars". THESIS_FST_XXX_Bauer_C.xml, 1995. http://handle.uws.edu.au:8081/1959.7/251.

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Observations were made of 309 binary systems between RA 17h - 07h and Dec -70 degrees to -60 degrees. The images were calibrated against pairs measured for CCD astometry. Measurements were made of separations, position angles and differential magnitudes. Uncertainties in position angle and separation were 7.8o/p and 0.16 arcseconds respectively. The position angles, separations and differential V magnitudes were compared with WDS figures. It was determined that only 29% _+ 5% of the observed pairs had undergone significant movement since the last previous measurement, which agrees with the results of a survey of the WDS. A statistical study of 1q77 pairs found that the spread of calculated separations agreed with those found by other authors, while the distribution of periods, while falling within the range(s) calculated by other authors, were significantly longer. A short-arc fitting program was tested using data derived from the published orbit of Centauri before being applied to seven observed pairs. Orbits could be calculated for six of the seven pairs. For four of these pairs the observed movement may be due to proper motion rather than orbital motion
Master of Science (Hons)

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Bauer, Christina. "Astrometric observations of wide southern double stars". Thesis, View thesis, 1995. http://handle.uws.edu.au:8081/1959.7/251.

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Bauer, Christina. "Astrometric observations of wide southern double stars /". View thesis, 1995. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20030827.113613/index.html.

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Wainwright, C. L. "The effects of spin-orbit coupling on gravitational wave uncertainties". Pomona College, 2007. http://ccdl.libraries.claremont.edu/u?/stc,20.

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Paper discusses the expected uncertainty of orbital parameters of binary stars as measured by the space-based gravitational wave observatory LISA (Laser Interferometer Space Antenna) and how the inclusion of spin in the model of the binary stars affects the uncertainty. The uncertainties are found by calculating the received gravitational wave from a binary pair and then performing a linear least-squares parameter estimation. The case of a 1500 solar mass black hole that is 20 years from coalescing with a 1000 solar mass black hole--both of which are 50 x 10^6 light years away--is analyzed, and the results show that the inclusion of spin has a negligible effect upon the angular resolution of LISA but can increase the accuracy in mass and distance measurements by factors of 15 and 65, respectively.

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Chanamé, Domínguez Julio César. "Topics of galactic structure and stellar and chemical evolution". Connect to resource, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1126128106.

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Thesis (Ph. D.)--Ohio State University, 2005.
Title from first page of PDF file. Document formatted into pages; contains xv, 286 p.; also includes graphics (some col.). Includes bibliographical references (p. 275-286). Available online via OhioLINK's ETD Center

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Xu, Huangjian. "A study of the binary radio star LSI +61 303". Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/28358.

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We present new 6 cm observations of the binary radio, X-ray and ɿ -ray star GT0236+610 (LSI+61°303) obtained in August 1984 and September 1986. Ve calculate an improved period for the source's periodic radio outbursts of 26.50 ± 0.03 days. No significant period derivative was found. Based on an analysis of 201 flux density measurements from 1977 August to 1986 September, we find evidence for a possible 4 year modulation of the amplitude of the 26.50 day periodic radio outbursts. A precessing jet model for this long period modulation is discussed.
Science, Faculty of
Physics and Astronomy, Department of
Graduate

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Rainger, Paul P. "Studies of low-mass interacting binary stars". Thesis, University of St Andrews, 1990. http://hdl.handle.net/10023/14369.

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Spectroscopic and photometric observations of eight contact/near-contact binaries are presented and analysed. Spectroscopic observations were obtained at 4200 Å (radial velocity spectra) and 6563 Å (hydrogen-alpha line profiles). New photometric observations were obtained at visual and infrared wavelengths, and other previously published light curves are also re-analysed. Absolute dimensions have been obtained for five systems; TY Boo, VW Boo, BX And, SS Ari and AG Vir, and their evolutionary positions discussed. Four of the systems are found to be in marginal but poor thermal contact, exhibiting regions of apparent "excess luminosity" in their light curves. A qualitative analysis of these "hot spot" regions has been attempted for the first time using spot models now incorporated into a light curve synthesis programme. Substantial time for this project was awarded on telescopes funded by the United Kingdom Science and Engineering Research Council (SERC), comprising 14 nights at the Issac Newton Telescope (INT) on La Palma, and 4 nights at the United Kingdom Infrared Telescope (UKIRT) on Mauna Kea. Additional observations were made during an 8 night commissioning run on the Jacobus Kapteyn Telescope (JKT) on La Palma, and extensive observations were made with the Twin Photometric Telescope (TPT) at St Andrews University Observatory between 1985 and 1989. These resulted in over 100 spectra at 4200 Å and over 50 spectra at 6563 Å (INT and JKT observations), over 300 infrared photometric observations (UKIRT), and over 3500 visual photometric observations (TPT). Of the five systems analysed in detail in this work, TY Boo appears to be a normal shallow-contact W-type system. Both VW Boo and BX And exhibit regions of "excess luminosity" around the ingress and egress of secondary minimum which are well modelled by a warm spot on the cooler component sitting symmetrically around the neck joining the pair. Such a phenomenon may be expected to arise naturally in systems which have come into contact but are not yet/currently in thermal contact, exhibiting a temperature difference between the components. BXAnd like other B-type systems seems to be reaching this contact state for the first time, but the position of VW Boo is uncertain, and whilst evidence that it could be in the "broken contact" state predicted by the TRO Theory is far from conclusive, its lower orbital angular momentum clearly marks the system as worthy of further study. SS Ari and AG Vir exhibit light curves with unequal quadrature heights. Attempts to treat the higher quadrature as a region of "excess luminosity" due to an energy transfer "warm spot" does not however provide a good model of this phenomenon. Since invoking a dark starspot model also does not provide a good explanation for such systems, it may be that this form of light curve distortion is due to an entirely different form of distorting surface phenomenon. Like BX And, AG Vir appears to be just reaching contact for the first time, but like VW Boo, the slightly lower angular momentum of SS Ari warrants further study.

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Edwards, Philip Gregory. "A search for ultra high energy gamma ray emission from binary X-ray systems". Title page, contents and summary only, 1988. http://web4.library.adelaide.edu.au/theses/09PH/09phe266.pdf.

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Libri sul tema "Double stars"

Walker, Richard L. Micrometer measures of 711 double stars. Washington: U.S. G.P.O., 1985.

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Worley, Charles E. Micrometer measures of 2589 double stars. Washington, D.C: U.S. Government Printing Office, 1989.

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Vanbeveren, D. The brightest binaries. Dordrecht: Kluwer Academic Publishers, 1998.

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United States. National Aeronautics and Space Administration., a cura di. LSS 2018: A double-lined spectroscopic binary central star with an extremely large reflection effect. [Washington, D.C.?: National Aeronautics and Space Administration?, 1985.

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I, Pustylʹnik, a cura di. Nestat͡s︡ionarnye prot͡s︡essy v tesnykh dvoĭnykh sistemakh: Materialy vsesoi͡u︡znogo soveshchanii͡a︡, Tyravere, 10-14 okti͡a︡bri͡a︡ 1989 g. [Tallinn]: Eesti Teaduste Akadeemia, W. Struve nim. Tartu Astroüüsika Observatoorium, 1989.

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G, Campbell C. Magnetohydrodynamics in binary stars. Dordrecht: Kluwer Academic Publishers, 1997.

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Argyle, R. W., a cura di. Observing and Measuring Visual Double Stars. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-3945-5.

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Argyle, Bob, a cura di. Observing and Measuring Visual Double Stars. London: Springer-Verlag, 2004. http://dx.doi.org/10.1007/b97664.

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International, Workshop on Double and Multiple Stars: Dynamics Physics and Instrumentation (2009 Santiago de Compostela Spain). International Workshop on Double and Multiple Stars: Dynamics, Physics, and Instrumentation, Santiago de Compostela, Spain, 10-11 December 2009. Melville, N.Y: American Institute of Physics, 2011.

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Capitoli di libri sul tema "Double stars"

van Zyl, J. E. "Stars and Double Stars". In Unveiling the Universe, 157–93. London: Springer London, 1996. http://dx.doi.org/10.1007/978-1-4471-1037-8_10.

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Eagle, Dave. "Variable and Double Stars". In The Patrick Moore Practical Astronomy Series, 89–106. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-8766-1_6.

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Rakos, K. D., H. A. McAlister, H. A. Abt, P. Couteau, J. Dommanget, M. G. Fracastoro, R. S. Harrington e A. A. Kiselyov. "Double and Multiple Stars". In Reports on Astronomy, 253–56. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2981-4_18.

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Bergeron, Jacqueline. "Double and Multiple Stars". In Reports on Astronomy, 239–42. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1100-3_18.

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West, Richard M. "Double and Multiple Stars". In Reports on Astronomy, 269–75. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5392-5_18.

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Leverington, David. "Variable and Double Stars". In A History of Astronomy, 154–70. London: Springer London, 1995. http://dx.doi.org/10.1007/978-1-4471-2124-4_8.

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Argyle, Bob, e R. W. Argyle. "Why Observe Double Stars?" In Observing and Measuring Visual Double Stars, 17–24. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-3945-5_2.

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Argyle, Bob, e R. W. Argyle. "Ten Famous Double Stars". In Observing and Measuring Visual Double Stars, 91–103. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-3945-5_9.

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McNally, Derek. "Double and Multiple Stars". In Reports on Astronomy, 243–46. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3364-7_18.

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Ihas, Dijana, Miranda Wilson e Gaelen McCormick. "Lonely Stars—Cello". In Teaching Violin, Viola, Cello, and Double Bass, 281–88. New York: Routledge, 2023. http://dx.doi.org/10.4324/9781003154938-44.

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Atti di convegni sul tema "Double stars"

Docobo, J. A., M. Andrade e P. P. Campo. "Guests in double stars". In INTERNATIONAL WORKSHOP: BINARIES INSIDE AND OUTSIDE THE LOCAL INTERSTELLAR BUBBLE. AIP, 2012. http://dx.doi.org/10.1063/1.4718583.

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van den Heuvel, E. P. J. "Double Neutron Stars: Evidence For Two Different Neutron‐Star Formation Mechanisms". In THE MULTICOLORED LANDSCAPE OF COMPACT OBJECTS AND THEIR EXPLOSIVE ORIGINS. American Institute of Physics, 2007. http://dx.doi.org/10.1063/1.2774916.

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Indriati, Diari, Widodo, Indah E. Wijayanti e Kiki A. Sugeng. "On total irregularity strength of star graphs, double-stars and caterpillar". In PROCEEDINGS OF THE 7TH SEAMS UGM INTERNATIONAL CONFERENCE ON MATHEMATICS AND ITS APPLICATIONS 2015: Enhancing the Role of Mathematics in Interdisciplinary Research. AIP Publishing LLC, 2016. http://dx.doi.org/10.1063/1.4940809.

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Arenou, F., J. A. Docobo, V. S. Tamazian e Y. Y. Balega. "Simulating multiple stars in preparation for Gaia". In INTERNATIONAL WORKSHOP ON DOUBLE AND MULTIPLE STARS: DYNAMICS, PHYSICS, AND INSTRUMENTATION. AIP, 2011. http://dx.doi.org/10.1063/1.3597593.

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Pourbaix, D., J. A. Docobo, V. S. Tamazian e Y. Y. Balega. "Screening and modelling the double and multiple stars observed by Gaia". In INTERNATIONAL WORKSHOP ON DOUBLE AND MULTIPLE STARS: DYNAMICS, PHYSICS, AND INSTRUMENTATION. AIP, 2011. http://dx.doi.org/10.1063/1.3597594.

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Docobo, J. A., J. F. Ling, J. A. Docobo, V. S. Tamazian e Y. Y. Balega. "Binary stars with late-type components: 6 orbits and system masses". In INTERNATIONAL WORKSHOP ON DOUBLE AND MULTIPLE STARS: DYNAMICS, PHYSICS, AND INSTRUMENTATION. AIP, 2011. http://dx.doi.org/10.1063/1.3597589.

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Dewi, J. D. M., Ph Podsiadlowski e O. R. Pols. "The Ps − e relation of double neutron stars". In THE MULTICOLORED LANDSCAPE OF COMPACT OBJECTS AND THEIR EXPLOSIVE ORIGINS. American Institute of Physics, 2007. http://dx.doi.org/10.1063/1.2774924.

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Sinachopoulos, D. "CCD Measurements of Hipparcos Wide Visual Double Stars". In RECENT ADVANCES IN ASTRONOMY AND ASTROPHYSICS: 7th International Conference of the Hellenic Astronomical Society. AIP, 2006. http://dx.doi.org/10.1063/1.2348006.

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Tamazian, V. S., J. A. Docobo, Yu Yu Balega, N. D. Melikian, E. A. Malogolovets, J. A. Docobo, V. S. Tamazian e Y. Y. Balega. "EMCCD Speckle Measurements, Differential Photometry and Dynamical Masses of Visual Binary Stars". In INTERNATIONAL WORKSHOP ON DOUBLE AND MULTIPLE STARS: DYNAMICS, PHYSICS, AND INSTRUMENTATION. AIP, 2011. http://dx.doi.org/10.1063/1.3597584.

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Stoica, Sabin, Livius Trache, Alexei Smirnov e Sabin Stoica. "Introduction to Double Beta Decay". In EXOTIC NUCLEI AND NUCLEAR∕PARTICLE ASTROPHYSICS (III): From Nuclei to Stars. AIP, 2010. http://dx.doi.org/10.1063/1.3527255.

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Rapporti di organizzazioni sul tema "Double stars"

Dutta, Sumit. Locating Double Stars in the UCAC with the WDS Catalog and CCD Parameters. Fort Belvoir, VA: Defense Technical Information Center, luglio 2008. http://dx.doi.org/10.21236/ada482998.

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Zilberman, Mark. Shouldn’t Doppler 'De-boosting' be accounted for in calculations of intrinsic luminosity of Standard Candles? Intellectual Archive, settembre 2021. http://dx.doi.org/10.32370/iaj.2569.

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"Doppler boosting / de-boosting" is a well-known relativistic effect that alters the apparent luminosity of approaching/receding radiation sources. "Doppler boosting" alters the apparent luminosity of approaching light sources to appear brighter, while "Doppler de-boosting" alters the apparent luminosity of receding light sources to appear fainter. While "Doppler boosting / de-boosting" has been successfully accounted for and observed in relativistic jets of AGN, double white dwarfs, in search of exoplanets and stars in binary systems it was ignored in the establishment of Standard Candles for cosmological distances. A Standard Candle adjustment appears necessary for "Doppler de-boosting" for high Z, otherwise we would incorrectly assume that Standard Candles appear dimmer, not because of "Doppler de-boosting" but because of the excessive distance, which would affect the entire Standard Candles ladder at cosmological distances. The ratio between apparent (L) and intrinsic (Lo) luminosities as a function of redshift Z and spectral index α is given by the formula ℳ(Z) = L/Lo=(Z+1)^(α-3) and for Type Ia supernova as ℳ(Z) = L/Lo=(Z+1)^(-2). These formulas are obtained within the framework of Special Relativity and may require adjustments within the General Relativity framework.

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Mason, Brian D. Various Orbital Solutions and Double Star Statistics. Fort Belvoir, VA: Defense Technical Information Center, ottobre 2011. http://dx.doi.org/10.21236/ada564705.

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Bellwied, R., R. Beuttenmuller e W. Chen. Double particle resolution in STAR silicon drift detectors. Office of Scientific and Technical Information (OSTI), ottobre 1996. http://dx.doi.org/10.2172/425351.

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Jessen, Anneke, María de la Paz Covarrubias, Andrew Katona e Rafael Cornejo. Integration and Trade in the Americas: A Preliminary Estimate of 2001 Trade. Inter-American Development Bank, dicembre 2001. http://dx.doi.org/10.18235/0008266.

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This 2001 report contains the preliminary estimates for Trade in the Americas, with a most notable decline of trade flows in the Western Hemisphere. In 2001, trade within the Americas declined by almost 4% according to preliminary estimates. Contrary to previous years, intra-hemispheric exports performed worse than the hemisphere's exports to the rest of the world, which declined by a less drastic 2% relative to 2000. This in stark contrast to a decade-long trend that saw intra-hemispheric trade expand by more than double the rate of extra-hemispheric exports, with total exports growing by a healthy 8% a year on average. For most countries, the estimates are based on data available for the period January-September.

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Thomas, Strobel. A contrastive approach to grammatical doubts in some contemporary Germanic languages (German, Dutch, Swedish). Goethe-Universität Frankfurt a.M., marzo 2023. http://dx.doi.org/10.21248/gups.72278.

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Unquestionably (or: undoubtedly), every competent speaker has already come to doubt with respect to the question of which form is correct or appropriate and should be used (in the standard language) when faced with two or more almost identical competing variants of words, word forms or sentence and phrase structure (e.g. German "Pizzas/Pizzen/Pizze" 'pizzas', Dutch "de drie mooiste/mooiste drie stranden" 'the three most beautiful/most beautiful three beaches', Swedish "större än jag/mig" 'taller than I/me'). Such linguistic uncertainties or "cases of doubt" (cf. i.a. Klein 2003, 2009, 2018; Müller & Szczepaniak 2017; Schmitt, Szczepaniak & Vieregge 2019; Stark 2019 as well as the useful collections of data of Duden vol. 9, Taaladvies.net, Språkriktighetsboken etc.) systematically occur also in native speakers and they do not necessarily coincide with the difficulties of second language learners. In present-day German, most grammatical uncertainties occur in the domains of inflection (nominal plural formation, genitive singular allomorphy of strong masc./neut. nouns, inflectional variation of weak masc. nouns, strong/weak adjectival inflection and comparison forms, strong/weak verb forms, perfect auxiliary selection) and word-formation (linking elements in compounds, separability of complex verbs). As for syntax, there are often doubts in connection with case choice (pseudo-partitive constructions, prepositional case government) and agreement (especially due to coordination or appositional structures). This contribution aims to present a contrastive approach to morphological and syntactic uncertainties in contemporary Germanic languages (mostly German, Dutch, and Swedish) in order to obtain a broader and more fine-grained typology of grammatical instabilities and their causes. As will be discussed, most doubts of competent speakers - a problem also for general linguistic theory - can be attributed to processes of language change in progress, to language or variety contact, to gaps and rule conflicts in the grammar of every language or to psycholinguistic conditions of language processing. Our main concerns will be the issues of which (kinds of) common or different critical areas there are within Germanic (and, on the other hand, in which areas there are no doubts), which of the established (cross-linguistically valid) explanatory approaches apply to which phenomena and, ultimately, the question whether the new data reveals further lines of explanation for the empirically observable (standard) variation.

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Lever, James, e Jason Weale. High efficiency fuel sleds for Polar traverses. Engineer Research and Development Center (U.S.), marzo 2022. http://dx.doi.org/10.21079/11681/43445.

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We describe here the evolution of lightweight, high-efficiency fuel sleds for Polar over-snow traverses. These sleds consist of flexible bladders strapped to sheets of high molecular weight polyethylene. They cost 1/6th, weigh 1/10th and triple the fuel delivered per towing tractor compared with steel sleds. An eight-tractor fleet has conducted three 3400-km roundtrips to South Pole with each travers delivering 320,000 kg of fuel while emitting <1% the pollutants, consuming 1/2 the fuel and saving $1.6 M compared with aircraft resupply. A two tractor fleet in Greenland recently delivered 83,000 kg of fuel in bladder sleds to Summit with similar benefits. Performance monitoring has revealed that bladder-sled towing resistance is largely governed by sliding friction, which can start high and drop in half over the first 30 min of travel. Frictional heating probably produces a thin water layer that lubricates the sled–snow interface. Consequently, towing resistance depends on the thermal budget of the sled. For example, black fuel bladders increase solar gain and thus decrease sled resistance; data suggest they could double again the fuel delivered per tractor. The outstanding efficiency and low cost of these sleds has transformed fuel delivery to Polar research stations.

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Fitzpatrick, Rachael. Secondary Education Provision and Impacts of Low Secondary Uptake on Wider Societal Outcomes. Institute of Development Studies, agosto 2022. http://dx.doi.org/10.19088/k4d.2022.122.

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This report explores the current uptake and completion of secondary education globally, with a particular focus on sub-Saharan Africa. The report also explores the wider societal benefits of increased secondary completion rates, and the financial considerations that are needed to increase uptake and completion. Using data from UIS (2022) and UNESCO WIDE (2022), the report identified disparities in net enrolment, attendance and completion between primary and both levels of secondary education, particularly upper secondary. In sub-Saharan African countries, achievements in net enrolment at primary level are rarely met with high enrolment levels at either lower or upper secondary level, with this difference even more stark when observing completion rates. Currently, both lower and upper secondary education is not a funding priority amongst many countries in sub-Saharan Africa. Of the 27 countries included in analysis, only one country (Mauritius) spent a higher proportion on secondary education compared to other levels (UIS, 2022). Some countries were found to spend a higher proportion of GDP on tertiary education compared to other education levels, with over double the amount spent on tertiary compared to both lower and upper secondary education combined in some instances (Ethiopia, Sierra Leone, South Sudan) (UIS, 2022).

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Heath, Samantha, Sue Hudson, Nasyitah Abd Aziz, Adrianna Grogan, Bernadette Solomon, Christianah Adesina, Eltahir Kabbar et al. Stocktake of placement preparation and clinical experience for Aotearoa New Zealand student nurses in aged care settings: July 2023. Unitec ePress, ottobre 2023. http://dx.doi.org/10.34074/rsrp.103.

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The global population is getting older. In 2019 there were 703 million people aged ≥65 years. This figure is predicted to double to 1.5 billion, or 16% of the global population, by 2050 (United Nations, 2020). By comparison, Aotearoa New Zealand is expected to see a 36% increase in people aged ≥65 years for the ten years between 2021 and 2031 (Stats NZ, 2020). Since age is the most significant predictor for the most common health conditions, and the prevalence of chronic diseases and disability is also set to increase, pressures on most healthcare services are likely to escalate (Inouye et al., 2021). The Better Later Life (2019–2034) strategy sets out key areas of action for addressing a response to our ageing population. It recognises the importance of promoting healthy ageing and improving access to services as a fundamental part of the realisation of the strategy. A key factor underpinning this action is the education of health professionals. Nurses are at the front line of healthcare and are ideally placed to respond to the changing demographic. As a profession, we need to analyse how well we are preparing nurses for undertaking the work that will be required. As educators, we need to anticipate curriculum developments which may be required to support a well-prepared profession.

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Barham, Tania, Karen Macours e John A. Maluccio. More Schooling and More Learning?: Effects of a Three-Year Conditional Cash Transfer Program in Nicaragua after 10 Years. Inter-American Development Bank, luglio 2013. http://dx.doi.org/10.18235/0011482.

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Conditional Cash Transfer (CCT) programs have become the anti-poverty program of choice in many developing countries. Numerous evaluations, often based on rigorous experimental designs, leave little doubt that such programs can increase enrollment and grades attained--in the short term. But evidence is notably lacking on whether these short-term gains translate into longer-term educational benefits needed to fully justify these programs. This paper uses the randomized phase-in of the RPS CCT program in Nicaragua to estimate the long-term effects on educational attainment and learning for boys, measured 10 years after the start of the program. We focus on a cohort of boys aged 9¿12 years at the start of the program in 2000 who, due to the program¿s eligibility criteria and prior school dropout patterns, were likely to have benefitted more in the group of localities that were randomly selected to receive the program first. We find that the short-term program effect of a half grade increase in schooling for boys was sustained after the end of the program and into early adulthood. In addition, results indicate significant and substantial gains in both math and language achievement scores, an approximately one-quarter standard deviation increase in learning outcomes for the now young men. Hence in Nicaragua, schooling and achievement gains coincided, implying important long term returns to CCT programs.

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