Dissertations / Theses on the topic 'White dwarf stars Spectra'
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Liebert, J., R. A. Saffer, and C. A. Pilachowski. "High Dispersion Observations of H alpha in the Suspected Brown Dwarf, White Dwarf Binary System G29-38." Steward Observatory, The University of Arizona (Tucson, Arizona), 1988. http://hdl.handle.net/10150/623899.
Full textBainbridge, Matthew, Martin Barstow, Nicole Reindl, W. Ü. Tchang-Brillet, Thomas Ayres, John Webb, John Barrow, et al. "Probing the Gravitational Dependence of the Fine-Structure Constant from Observations of White Dwarf Stars." MDPI AG, 2017. http://hdl.handle.net/10150/625061.
Full textLevenhagen, Ronaldo S., Marcos P. Diaz, Paula R. T. Coelho, and Ivan Hubeny. "A Grid of Synthetic Spectra for Hot DA White Dwarfs and Its Application in Stellar Population Synthesis." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/624926.
Full textChen, Eugene Yu-Yu. "White dwarf stars with some hydrogen." Diss., Restricted to subscribing institutions, 2008. http://proquest.umi.com/pqdweb?did=1799891611&sid=6&Fmt=2&clientId=1564&RQT=309&VName=PQD.
Full textThompson, A. M. "Energy transport in radially accreting white dwarf stars." Thesis, University of Glasgow, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234837.
Full textMontgomery, Michael Houston. "The evolution and pulsation of crystallizing white dwarf stars /." Full text (PDF) from UMI/Dissertation Abstracts International, 1998. http://wwwlib.umi.com/cr/utexas/fullcit?p9937100.
Full textDickinson, Nathan James. "The metal content of hot DA white dwarf spectra." Thesis, University of Leicester, 2012. http://hdl.handle.net/2381/10919.
Full textDay-Jones, A. C. "Searching for brown dwarf companions." Thesis, University of Hertfordshire, 2009. http://hdl.handle.net/2299/3475.
Full textSnyder, Lucas A. "On the reliability of 2MASS data in identifying red dwarf stars." Virtual Press, 2004. http://liblink.bsu.edu/uhtbin/catkey/1294901.
Full textDepartment of Physics and Astronomy
Yeates, Celeste Marie Clemens J. Christopher. "Mode identification from combination frequency amplitudes in pulsating white dwarf stars." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2006. http://dc.lib.unc.edu/u?/etd,389.
Full textTitle from electronic title page (viewed Oct. 10, 2007). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Physics & Astronomy." Discipline: Physics and Astronomy; Department/School: Physics and Astronomy.
Pelisoli, Ingrid Domingos. "White dwarf and subdwarf stars in the sloan digital sky survey." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2018. http://hdl.handle.net/10183/180510.
Full textWhite dwarf stars are the final observable evolutionary state of over 95% of stars and also a common outcome in binary evolution. Therefore, studying white dwarfs is a powerful tool to understand both single and binary stellar evolution, local initial mass function, and post-main sequence mass loss, leading us to a better comprehension of the history of stellar formation and evolution of different stellar populations. In order to make this type of studies possible, a large and preferably complete sample of white dwarf stars, covering the whole range of physical parameters, is required. The simplest way to achieve that is to take advantage of data provided by large surveys. The Sloan Digital Sky Survey has already allowed the increase of the number of known white dwarf stars fivefold up to its data release 10. In this work, we extended the search for white dwarfs to the new objects in the data release 12, discovering 3 157 new white dwarfs and 1 349 new subdwarfs. For the first time, we have extended this search to log g < 6.5, corresponding to M < 0.3 M⊙. White dwarfs below this mass limit cannot be formed through single evolution within a Hubble time; however, if the star is part of a close binary system, the mass loss of the system may be so intense that the resulting white dwarf has mass below the single evolution limit. These objects are known as extremely-low mass white dwarfs (ELMs) They show Teff < 20 000 K and 5.0 . log g . 6.5 and spectra very similar to main sequence A stars. Less than a hundred of them are known, and most objects were discovered relying on biased selection criteria, that excluded cool (Teff < 9 000 K), lowermass (M . 0.15 M⊙) ELMs, making it difficult to validate the models and comprehend the properties of the ELMs as a class. We have identified thousands of objects whose physical properties, effective temperature and surface gravity, place them in the range of by-products of binary interaction such as the ELMs. We have called them sdAs, referring to their sub-main sequence log g and hydrogen dominated spectra. They seem to be composed of overlapping stellar populations, and we found that at least 7% are more likely ELMs or their precursors, the pre-ELMs, than main sequence stars. Obtaining time-resolved spectroscopy for 26 objects, we could confirm 15 to be in close binaries. One of them is also an eclipsing system, while another is a pulsator — the eighth member of the pulsating ELM class. Other six new pulsators were found as part of our follow-up, five of them in the vicinity of the ELM instability strip. With these results, we increase the population of ELMs by 20%, raising the fraction of cool ELMs from 4 to 20%, which is consistent with the predictions from the evolutionary models.
Ramos, Gabriel Lauffer. "Evolutionary sequences for H and He atmosphere massive white dwarf stars." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2018. http://hdl.handle.net/10183/181005.
Full textKawka, Adela. "A study of white dwarfs in the solar neighbourhood." Thesis, Kawka, Adela (2003) A study of white dwarfs in the solar neighbourhood. PhD thesis, Murdoch University, 2003. https://researchrepository.murdoch.edu.au/id/eprint/120/.
Full textKawka, Adela. "A study of white dwarfs in the solar neighbourhood." Kawka, Adela (2003) A study of white dwarfs in the solar neighbourhood. PhD thesis, Murdoch University, 2003. http://researchrepository.murdoch.edu.au/120/.
Full textToloza, O., B. T. Gänsicke, J. J. Hermes, D. M. Townsley, M. R. Schreiber, P. Szkody, A. Pala, et al. "GW Librae: a unique laboratory for pulsations in an accreting white dwarf." OXFORD UNIV PRESS, 2016. http://hdl.handle.net/10150/621433.
Full textCamarota, Lawrence Francis, and Lawrence Francis Camarota. "Determining the Pressure Shift of Helium I Lines Using White Dwarf Stars." Diss., The University of Arizona, 2017. http://hdl.handle.net/10150/625365.
Full textPreval, Simon Paul. "Heavy metal opacity and line blanketing in hot DA white dwarf stars." Thesis, University of Leicester, 2015. http://hdl.handle.net/2381/32281.
Full textSaffer, R. A., and J. Liebert. "Search for Close Binary Evolved Stars." Steward Observatory, The University of Arizona (Tucson, Arizona), 1988. http://hdl.handle.net/10150/623897.
Full textWest, Steven Charles. "The development of a near-infrared polarimeter and its application to the continuum polarization of magnetic white dwarfs." Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184285.
Full textLiebert, J., C. C. Dahn, and D. G. Monet. "Luminosity Function of White Dwarfs in the Local Disk and Halo." Steward Observatory, The University of Arizona (Tucson, Arizona), 1988. http://hdl.handle.net/10150/623908.
Full textFarihi, J., D. Koester, B. Zuckerman, L. Vican, B. T. Gänsicke, N. Smith, G. Walth, and E. Breedt. "Solar abundances of rock-forming elements, extreme oxygen and hydrogen in a young polluted white dwarf." OXFORD UNIV PRESS, 2016. http://hdl.handle.net/10150/622949.
Full textMunn, Jeffrey A., Hugh C. Harris, Hippel Ted von, Mukremin Kilic, James W. Liebert, Kurtis A. Williams, Steven DeGennaro, et al. "A DEEP PROPER MOTION CATALOG WITHIN THE SLOAN DIGITAL SKY SURVEY FOOTPRINT. II. THE WHITE DWARF LUMINOSITY FUNCTION." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/622633.
Full textSing, David Kent. "Post Common Envelope Pre-Cataclysmic and Cataclysmic Variable Binaries." Diss., Tucson, Arizona : University of Arizona, 2005. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu%5Fetd%5F1400%5F1%5Fm.pdf&type=application/pdf.
Full textZong, Weikai. "Amplitude and frequency modulations of oscillation modes in hot B subdwarf and white dwarf stars from Kepler photometry." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30306/document.
Full textNonlinear mode interactions, inducing amplitude and frequency modulations, are difficult to observe from ground-based telescopes as these typical timescales of the modulations are of the order of weeks, months, or even years. The launch of space telescopes such as Kepler (operated by NASA) has tremendously changed the situation by providing new data for this research field. In this thesis, we analyze the Kepler photometric data observed for 24 compact pulsators, including 18 hot B subdwarf (sdB) stars and six white dwarf stars. We find that it is a common phenomenon that oscillation modes in these pulsating stars show amplitude and/or frequency variations. We focus in particular on two stars, KIC 08626021, a DB white dwarf, and KIC 10139564, a short period sdB star. KIC 08626021 and KIC 10139564 have been monitored by Kepler in short-cadence mode for nearly two years and more than three years without interruption, respectively. By analyzing in depth these high-quality photometric data, we find that the modes within triplets induced by rotation clearly reveal different types of behaviors : their frequency and amplitude may exhibit either periodic or irregular modulations, or remain constant. These various behaviors can be linked to those predicted within the amplitude equation formalism in the case of the nonlinear resonant mode coupling mechanism, particularly for the modulation timescales. Furthermore, we find that the triplet resonance modes can also interact with outside modes through other types of resonances such as the three-mode resonance v 0 ~ v 1 + v 2 , which is not considered within the current nonlinear theoretical frameworks. These findings constitute the first clear evidence of nonlinear resonant mode couplings occurring in compact pulsators. This should resonate as a warning to projects aiming at measuring the evolutionary change rate of pulsation periods in compact stars in general. Nonlinear modulations of the frequencies can potentially jeopardize any attempt to measure reliably such rates, unless they can be corrected beforehand. The observed modulations characterized in this thesis provide new insights to "nonlinear asteroseismology" and call for new methods to process the signals of variable modes from the observed light curves. We foresee that increasing attention will focus on these nonlinear phenomena in various types of pulsating stars observed from space in the near future, thus reviving interest in the nonlinear oscillation theory in general
Voss, Björn. "White dwarfs in the SPY and HQS surveys an analysis of a large set of white dwarf spectra and a search for variable ZZ Ceti white dwarfs /." [S.l.] : [s.n.], 2006. http://e-diss.uni-kiel.de/diss_1796/d1796.pdf.
Full textAgüeros, Marcel A. "Candidate isolated neutron stars and other stellar x-ray sources from the ROSAT all-sky and Sloan Digital Sky Surveys /." Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/5436.
Full textPudas, Markus. "Identification of elements and molecules in the spectra of an M dwarf star using high resolution infrared spectroscopy." Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-325908.
Full textM dvärgstjärnor är de mest förekommande stjärnorna i vår galax. De har en mycket långlivslängd, vissa tusen gånger längre än vår sol. Det finns teorier om att planetbildning runt stjärnor styrs av halten av ämnen som inte är väte eller helium. Denna halt kallas metallicitet. För att på konstgjord eller syntetisk väg bestämma metalliciteten i Barnard’s stjärna, en M dvärg, behöver de ämnen som bidrar till absorptionslinjerna i fotosfären först identifieras. Målsättningen med detta arbete var att identifiera de grundämnen och eventuella molekyler som skapar absorptionslinjerna i spektrumet till Barnard’s stjärna. Detta arbete utfördes på institutionen för fysik och astronomi. Metoden använde ett modifierat IDL program för att läsa och plotta data. Högupplöst infraröd spektraldata från Jbandet (1.1–1.4 μm) till Barnard’s stjärna hämtades från CRIRES-POP databasen och data för det telluriska spektrumet från en databas med telluriska linjer. Därefter plottades de samtidigt i ett våglängdsöverlappande normaliserat spektra. I programmet gick absorptionslinjer som inte hade sitt ursprung i jordens atmosfär att urskilja manuellt. Då våglängderna för absorptionlinjerna bestämts, matades värden in i databasen VALD3. Analysen av de returnerade värdena från VALD3 genererade en resultatlista med de mest sannolika elementen för de olika absorptionsvåglängderna. Resultatlistan kan användas som ingångsvärde till program som syntetiskt beräknar metalliciteten. Resultaten överensstämmer till viss del med tidigare mätningar. Slutsatsen är att metoden med högupplöst infraröd spektral data kan användas för att bestämma en lista med element och molekyler från fotosfären i Barnard’s stjärna.
Jadhav, Yashashree Shirish. "Identifying Cataclysmic Variables in Sparsely Sampled Pan-STARRS1 data." Ohio University Honors Tutorial College / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ouhonors1400538970.
Full textHallakoun, N., (许偲艺) S. Xu, D. Maoz, T. R. Marsh, V. D. Ivanov, V. S. Dhillon, M. C. P. Bours, et al. "Once in a blue moon: detection of ‘bluing' during debris transits in the white dwarf WD 1145+017." OXFORD UNIV PRESS, 2017. http://hdl.handle.net/10150/625505.
Full textRodigas, Timothy J., P. Bergeron, Amélie Simon, Pamela Arriagada, Jacqueline K. Faherty, Guillem Anglada-Escudé, Eric E. Mamajek, et al. "MagAO IMAGING OF LONG-PERIOD OBJECTS (MILO). II. A PUZZLING WHITE DWARF AROUND THE SUN-LIKE STAR HD 11112." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/622154.
Full textPutney, Angela. "Magnetic white dwarf stars." Thesis, 1996. https://thesis.library.caltech.edu/3770/1/Putney_a_1996.pdf.
Full textRicher, Harvey. "Lives of White Dwarf Stars." 2008. http://hdl.handle.net/2429/589.
Full textRuan, Kui. "Photospheric studies of M dwarf stars." Phd thesis, 1991. http://hdl.handle.net/1885/138478.
Full textMullally, Fergal Robert 1979. "Substellar companions to white dwarves." Thesis, 2007. http://hdl.handle.net/2152/3375.
Full textAllers, Katelyn Natalie. "Disks and dissociation regions: the interaction of young stellar objects with their environments." Thesis, 2005. http://hdl.handle.net/2152/2234.
Full textKim, Agnès. "Probing exotic physics with pulsating white dwarfs." Thesis, 2007. http://hdl.handle.net/2152/3114.
Full textKim, Agnès 1975. "Probing exotic physics with pulsating white dwarfs." 2007. http://hdl.handle.net/2152/13301.
Full textParadis, Dominique. "The effects of crystallization on the pulsations of white dwarf stars." Thèse, 2004. http://hdl.handle.net/1866/14763.
Full text"Physical properties of white dwarf with a dark matter core." 2011. http://library.cuhk.edu.hk/record=b5894665.
Full textThesis (M.Phil.)--Chinese University of Hong Kong, 2011.
Includes bibliographical references (leaves 81-86).
Abstracts in English and Chinese.
Wong, Ka Wing = Han you an wu zhi he xin de bai ai xing de wu li xing zhi / Huang Jiarong.
Abstract --- p.ii
Acknowledgement --- p.iv
List of Abbreviations --- p.v
List of Figures --- p.vi
Table of Contents --- p.xi
Chapter 0 --- Introduction --- p.1
Chapter 1 --- White Dwarfs --- p.5
Chapter 1.1 --- Introduction --- p.5
Chapter 1.2 --- Observation --- p.6
Chapter 1.3 --- Mass-Radius Relationship & Mass Limit --- p.9
Chapter 1.4 --- Type Ia Supernovae --- p.14
Chapter 2 --- Dark Matter --- p.16
Chapter 2.1 --- Introduction --- p.16
Chapter 2.2 --- Observational Evidences --- p.17
Chapter 2.3 --- Dark Matter Candidates and their Categorization --- p.21
Chapter 3 --- Moon-sized White Dwarf with a Dark Matter Core --- p.26
Chapter 3.1 --- Introduction --- p.26
Chapter 3.2 --- Model --- p.29
Chapter 3.3 --- Results --- p.32
Chapter 3.3.1 --- Typical Density Profile --- p.32
Chapter 3.3.2 --- M-R Curves --- p.33
Chapter 3.3.3 --- Scaling in n --- p.35
Chapter 3.3.4 --- BPS Equation of State --- p.40
Chapter 3.4 --- Discussion --- p.41
Chapter 4 --- Newtonian Hydrodynamic Simulation of a Spherically Symmetric Star --- p.44
Chapter 4.1 --- Introduction --- p.44
Chapter 4.2 --- WENO Scheme --- p.46
Chapter 4.3 --- Runge-Kutta Time Discretization --- p.48
Chapter 4.4 --- Fluid Dynamics without Gravity in One Dimension --- p.49
Chapter 4.4.1 --- Riemann Problem Tests --- p.50
Chapter 4.5 --- Spherically Symmetric Fluid Dynamics without Gravity --- p.54
Chapter 4.5.1 --- Diffusion Problem --- p.55
Chapter 4.6 --- Spherically Symmetric Star --- p.57
Chapter 4.6.1 --- Radial Oscillation of a White Dwarf --- p.58
Chapter 4.6.2 --- Radial Oscillation of a White Dwarf with a Point-Sized Dark Matter Core --- p.64
Chapter 4.7 --- Discussion --- p.68
Chapter 5 --- Newtonian Hydrodynamic Simulation of a Spherically Symmetric Two-Fluid Star --- p.69
Chapter 5.1 --- Introduction --- p.69
Chapter 5.2 --- Spherically Symmetric Two-Fluid Stars --- p.70
Chapter 5.2.1 --- A White Dwarf with a Dark Matter Core --- p.71
Chapter 5.3 --- Discussion --- p.77
Chapter 6 --- Summary --- p.79
Bibliography --- p.81
Andrews, Jeffrey. "Double White Dwarfs as Probes of Single and Binary Star Evolution." Thesis, 2016. https://doi.org/10.7916/D8VH5NQ4.
Full textWeston, Jennifer Helen Seng. "Radio Observations as a Tool to Investigate Shocks and Asymmetries in Accreting White Dwarf Binaries." Thesis, 2016. https://doi.org/10.7916/D87M082M.
Full textFerrario, L. "Accretion processes in AM Herculis systems." Phd thesis, 1989. http://hdl.handle.net/1885/136627.
Full text"Properties of strange stars." 2003. http://library.cuhk.edu.hk/record=b5891677.
Full textThesis (M.Phil.)--Chinese University of Hong Kong, 2003.
Includes bibliographical references (leaves 98-101).
Text in English; abstracts in English and Chinese.
Wong Ka Wah = Qi yi xing de te xing / Huang Jiahua.
Chapter 1 --- Introduction --- p.1
Chapter 1.1 --- History of Compact Stars --- p.1
Chapter 1.2 --- The Proposal of Strange Quark Stars --- p.2
Chapter 1.3 --- Outline of the Thesis --- p.3
Chapter 2 --- Cold Equation of State from Perturbative QCD --- p.6
Chapter 2.1 --- Description of Strange Quark Matter --- p.7
Chapter 2.2 --- MIT Bag Model --- p.8
Chapter 2.3 --- Perturbative QCD --- p.10
Chapter 2.4 --- Comparison with MIT Bag Model --- p.11
Chapter 3 --- Static Structure of Strange Stars --- p.16
Chapter 3.1 --- Static Equilibrium --- p.16
Chapter 3.2 --- Models --- p.18
Chapter 3.3 --- Results of Global Properties and Discussions --- p.18
Chapter 4 --- Stability of Strange Quark Matter --- p.25
Chapter 4.1 --- Absolute Stable Condition --- p.25
Chapter 4.2 --- Weak Stable Condition --- p.26
Chapter 4.3 --- Stability Condition Compared to Neutron Stars --- p.27
Chapter 4.4 --- Conclusion --- p.28
Chapter 5 --- Effect of Massive Strange Quarks --- p.31
Chapter 5.1 --- Numerical Analysis of the Effect of Strange Quark Mass on the EOS --- p.33
Chapter 5.2 --- Structure of Strange Stars with Strange Quark Mass --- p.37
Chapter 5.3 --- Conclusion --- p.38
Chapter 6 --- QCD Phase Transition in a Compact Star --- p.46
Chapter 6.1 --- Cooling Properties --- p.47
Chapter 6.1.1 --- Heat capacity of quark stars --- p.49
Chapter 6.1.2 --- Luminosity of quark stars --- p.50
Chapter 6.1.3 --- Microphysics of the neutron star cooling --- p.54
Chapter 6.2 --- Handling of the Phase Transition --- p.56
Chapter 6.3 --- The Models --- p.59
Chapter 6.4 --- Results --- p.60
Chapter 6.4.1 --- Method 1 --- p.61
Chapter 6.4.2 --- Method 2 --- p.66
Chapter 6.5 --- Discussion and Conclusion --- p.66
Chapter 7 --- Formation of a Strange Star --- p.73
Chapter 7.1 --- Formalism of the Problem --- p.73
Chapter 7.2 --- Lagrangian Hydrodynamics --- p.74
Chapter 7.3 --- Hot Equation of State --- p.75
Chapter 7.3.1 --- Nuclear Matter EOS --- p.75
Chapter 7.3.2 --- Quark Matter EOS --- p.77
Chapter 7.3.3 --- Mixed Phase --- p.78
Chapter 7.4 --- Initial Models --- p.78
Chapter 7.5 --- Results --- p.80
Chapter 7.6 --- Discussion and Conclusion --- p.81
Chapter 8 --- Conclusion --- p.95
Bibliography --- p.98
Chapter A --- Solving the EOS --- p.102
Chapter B --- Solving C from Eq. (7.10) --- p.105
Kilic, Mukremin. "Cool white dwarfs and the age of the galaxy." Thesis, 2006. http://hdl.handle.net/2152/2733.
Full textFalcon, Ross Edward. "Creating and measuring white dwarf photospheres in a terrestrial laboratory." Thesis, 2014. http://hdl.handle.net/2152/25906.
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Mukadam, Anjum Shagufta. "Ensemble characteristics of the ZZ Ceti stars." Thesis, 2004. http://hdl.handle.net/2152/1278.
Full textMukadam, Anjum Shagufta Winget Donald Earl. "Ensemble characteristics of the ZZ Ceti stars." 2004. http://wwwlib.umi.com/cr/utexas/fullcit?p3143434.
Full textHermes, James Joseph Jr. "A search for periodic variations in pulse arrival times in DA white dwarfs." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-08-1998.
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Stephens, David. "3D1D modeling of the convective-reactive mixing in rapidly accreting white dwarfs." Thesis, 2019. http://hdl.handle.net/1828/11414.
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Lucy, Adrian B. "The Detection and Description of Symbiotic Accretion From Cool Evolved Stars." Thesis, 2021. https://doi.org/10.7916/d8-352d-xr22.
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