Academic literature on the topic 'Nebular abundances'
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Journal articles on the topic "Nebular abundances"
Pollacco, D. L., and S. A. Bell. "Imaging and spectroscopy of ejected common envelopes." Symposium - International Astronomical Union 180 (1997): 271. http://dx.doi.org/10.1017/s007418090013089x.
Full textPeña, Miriam, Grazyna Stasińska, César Esteban, Lars Koesterke, Selene Medina, and Robin Kingsburgh. "Spectroscopy of planetary nebulae with [WR] nuclei." Symposium - International Astronomical Union 193 (1999): 382–83. http://dx.doi.org/10.1017/s0074180900205846.
Full textWalton, N. A., M. J. Barlow, D. J. Monk, and R. E. S. Clegg. "Abundances and nebular and central star masses for Magellanic Cloud planetary nebulae." Symposium - International Astronomical Union 148 (1991): 334–36. http://dx.doi.org/10.1017/s0074180900200727.
Full textPagomenos, G. J. S., J. Bernard-Salas, and S. R. Pottasch. "Neon, sulphur, and argon abundances of planetary nebulae in the sub-solar metallicity Galactic anti-centre." Astronomy & Astrophysics 615 (July 2018): A29. http://dx.doi.org/10.1051/0004-6361/201730861.
Full textFlynn, G. J., S. Bajt, S. R. Sutton, M. E. Zolensky, K. L. Thomas, and L. P. Keller. "The Abundance Pattern of Elements Having Low Nebular Condensation Temperatures in Interplanetary Dust Particles: Evidence for a New Chemical Type of Chondritic Material." International Astronomical Union Colloquium 150 (1996): 291–94. http://dx.doi.org/10.1017/s0252921100501717.
Full textMonk, D. J., M. J. Barlow, and R. E. S. Clegg. "Chemical Abundances in Magellanic Cloud Planetary Nebulae." Symposium - International Astronomical Union 131 (1989): 354. http://dx.doi.org/10.1017/s0074180900138732.
Full textZhang, C. Y., and S. Kwok. "Chemical abundances and metallicity of Planetary Nebulae." Symposium - International Astronomical Union 180 (1997): 291. http://dx.doi.org/10.1017/s0074180900131080.
Full textConlon, E. S., P. L. Dufton, F. P. Keenan, and R. J. H. McCausland. "LSIV −12° 111 – A Newly Emerging Halo Planetary Nebula." Symposium - International Astronomical Union 155 (1993): 356. http://dx.doi.org/10.1017/s0074180900171451.
Full textSkillman, Evan D. "Uncertainties in nebular helium abundances." Proceedings of the International Astronomical Union 5, S268 (November 2009): 113–18. http://dx.doi.org/10.1017/s1743921310003947.
Full textStasińska, Grażyna. "Nebular abundances in galaxies: Beware of biases." Proceedings of the International Astronomical Union 5, S262 (August 2009): 93–96. http://dx.doi.org/10.1017/s1743921310002590.
Full textDissertations / Theses on the topic "Nebular abundances"
Wesson, Roger. "Heavy element abundances in emission line nebulae." Thesis, University College London (University of London), 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.430104.
Full textTsamis, Ionnis. "Heavy element abundance in ionized nebulae." Thesis, University College London (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270150.
Full textArmour, Mary-Helen. "A multicomponent echelle spectral data analysis of four planetary nebulae." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ56161.pdf.
Full textSmith, Christina Louise. "Spectroscopic studies of evolved stars and planetary nebulae." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/spectroscopic-studies-of-evolved-stars-and-planetary-nebulae(c01465c8-a7dd-4471-a37b-cc4ee01a9905).html.
Full textMoraes, Oscar Cavichia de. "Populações e evolução do bojo e região central da Galáxia." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/14/14131/tde-30012013-113804/.
Full textThis project proposes a comprehensive approach to describe the evolution of the central region of the Galaxy, comprising the bulge, the bar and their interfaces with the inner disk and the central region of the halo. We intend to investigate the chemical and kinematic properties of these structures, which are interconnected, aiming to separate them and apply these results to a model for the formation and evolution of the bulge and inner disk, capable to describe simultaneously distinct aspects of the evolution of the central region of the Galaxy. First, a sample of planetary nebulae (PNe) located in the inner-disk and bulge of the Galaxy is used in order to find the galactocentric distance that better separates these two populations, from the point of view of abundances. Statistical distance scales were used to study the distribution of abundances across the disk-bulge interface. A Kolmogorov-Smirnov test was used to find the distance in which the chemical properties of these regions better separates. The results of the statistical analysis indicate that, on the average, the inner population has lower abundances than the outer. Additionally, for the $\\alpha$-elements abundances, the inner population does not follow the disk radial gradient towards the galactic centre. Based on our results, we suggest a bulge-disk interface at 1.5 kpc, marking the transition between the bulge and inner-disk of the Galaxy, as defined by the intermediate mass population. Second, we present spectrophotometric observations for a sample of 21 PNe located towards the galactic centre of the Galaxy. The abundances are derived based on observations in the optical domain made at the SOAR telescope. Their location is interesting since there are no observations of PNe in this region. The data show lower oxygen abundances compared to those from PNe located in the inner disk and other bulge regions. The results show that the bulge has a complex composition of stellar populations. The presence of PNe with low abundances indicates that the bulge might be formed from an old galactic disk through secular evolution. On the other hand, other objects from our sample have abundances compared to those from inner disk PNe. This is evidence that two or more populations might compose the bulge: one originated from the thin disk, and the other from the thick disk. Last, we propose a chemical evolution model that includes radial gas flows. This is done in order to mimic the effects of the galactic bar on the chemical abundances distributions and the gas density profiles and the star formation rate (SFR). The results of the models with radial flows point to a high SFR in the bulge and, additionally, the SFR and gas density profiles in the inner Galaxy are better reproduced after the inclusion of radial gas flows in the model. After including a specific velocity pattern for the bar, the results show a flattening of the radial abundance gradient. Our results indicate that radial gas flows may play an important role in the star formation near the centre of barred spiral galaxies.
Nicholls, David Conway. "Nebular metallicities in isolated dwarf irregular galaxies." Phd thesis, 2014. http://hdl.handle.net/1885/11923.
Full textSterling, Nicholas Craig. "Light neutron-capture element abundances in planetary nebulae." Thesis, 2006. http://hdl.handle.net/2152/3503.
Full textHwang, Sehyun. "Integral field spectroscopy of optical recombination lines in the planetary nebula NGC 7009: implications for dual-abundance models." Thesis, 2009. http://hdl.handle.net/2152/ETD-UT-2009-08-386.
Full textΆκρας, Σταύρος. "Ανίχνευση και μελέτη φαινομένων μεσοαστρική ύλης." Thesis, 2010. http://nemertes.lis.upatras.gr/jspui/handle/10889/3289.
Full textThe aim of this PhD thesis was the study of two very important interstellar medium phenomena like the Planetary Nebulae (PNe) and the stellar bar in spiral galaxies. In particular, we studied 44 PNe in the Galactic bulge region and we determined their physical parameters, like the effective temperature and luminosity of the central star, the electron temperature and density, the abundance of He, N, O, S etc., using the photo-ionization model “Cloudy” (Akras et al. 2010a). It was also pursued to study the stellar bar component using the 3D radiative transfer model CRETE, in order to investigate the effects of a stellar bar component to the morphology of the galaxy and its dust content. In addition, the parameters of the bar component such as the length, the height, the inclination angle and the position angle were determined for four spiral galaxies (NGC 4013, UGC 2048, IC 2531 and our Galaxy). In the first part of the thesis, the PNe were separated according to their morphology (spherical, elliptical and bipolar shape) and we found that the He and N abundances are greater in bipolar PNe. Moreover, by using the statistical tool PCA, it was found that the circular and the elliptical PNe are different from the bipolar, since the log(O/N) takes negative values in the first two and positive or negative values in the bipolar PNe. The critical value was found at -0.18 dex, which corresponds to a stellar mass of 2.6 (Akras & Boumis 2007). In the second part, we managed to accurately describe the morphology of the bar component by using the function of hyperbolic ellipse. For different inclination angles of the observed galaxies, it was found that the “X-shape" feature can be seen only in the case where the inclination angle is greater than 60 degrees. In the case of Milky Way, it was found that the position angle of the bar is approximately 25 degrees and the length equals to 3.75 kpc (Akras et al. 2010b). Considering that the mean length of the bar component is equal to 3.0-4.0 kpc, it was determined that the position angle of a) NGC 4013 takes values between 5 and 10 degrees, b) UGC 2048 takes values between 40 and 50 degrees, c) IC 2531 takes values between 35 and 45 degrees, and our Galaxy takes values between 20 and 30 degrees (Akras et al. 2010b).
Books on the topic "Nebular abundances"
Planetary nebular carbon-to-oxygen ratios, morphology and evolution: Final technical report for NASA grant no. NSG 5358 : period covered by report, May 9, 1979 - July 14, 1987. [Washington, DC: National Aeronautics and Space Administration, 1987.
Find full textUnited States. National Aeronautics and Space Administration, ed. Planetary nebular carbon-to-oxygen ratios, morphology and evolution: Final technical report for NASA grant no. NSG 5358 : period covered by report, May 9, 1979 - July 14, 1987. [Washington, DC: National Aeronautics and Space Administration, 1987.
Find full textUnited States. National Aeronautics and Space Administration., ed. Planetary nebular carbon-to-oxygen ratios, morphology and evolution: Final technical report for NASA grant no. NSG 5358 : period covered by report, May 9, 1979 - July 14, 1987. [Washington, DC: National Aeronautics and Space Administration, 1987.
Find full textPlanetary nebular carbon-to-oxygen ratios, morphology and evolution: Final technical report for NASA grant no. NSG 5358 : period covered by report, May 9, 1979 - July 14, 1987. [Washington, DC: National Aeronautics and Space Administration, 1987.
Find full textTrieloff, Mario. Noble Gases. Oxford University Press, 2017. http://dx.doi.org/10.1093/acrefore/9780190647926.013.30.
Full textUnited States. National Aeronautics and Space Administration., ed. Theoretical studies of interstellar processes: Final report, December 1, 1991-February 28, 1995. Lexington, MA: Institute for Scientific Research, 1995.
Find full textBook chapters on the topic "Nebular abundances"
Liu, X. W., M. J. Barlow, I. J. Danziger, and P. J. Storey. "Nebular Abundances from Recombination Lines." In Chemical Evolution from Zero to High Redshift, 39–43. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-540-48360-1_5.
Full textDíaz, Angeles I., and Enrique Pérez-Montero. "Empirical Calibrations of Nebular Abundances: The Sulphur Abundance Parameter." In Chemical Evolution from Zero to High Redshift, 134–38. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-540-48360-1_31.
Full textWalton, N. A., M. J. Barlow, D. J. Monk, and R. E. S. Clegg. "Abundances and Nebular and Central Star Masses for Magellanic Cloud Planetary Nebulae." In The Magellanic Clouds, 334–36. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3432-3_79.
Full textMaciel, W. J. "Planetary Nebulae: Abundances and Abundance Gradients." In The Evolution of The Milky Way, 81–92. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-010-0938-6_8.
Full textClegg, R. E. S. "Abundances in Planetary Nebulae." In Planetary Nebulae, 139–56. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0865-9_30.
Full textSchmid, H. M., and H. Nussbaumer. "Elemental Abundances in Symbiotic Stars." In Planetary Nebulae, 402. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-2088-3_201.
Full textMarigo, Paola. "Theoretical Abundances in Planetary Nebulae." In Planetary Nebulae, 257. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5244-0_111.
Full textClegg, R. E. S., and J. P. Harrington. "Helium Abundances in Gaseous Nebulae." In Planetary Nebulae, 211. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0865-9_80.
Full textVilchez, J. M., and C. Esteban. "Abundances in WR Nebulae." In Wolf-Rayet Stars and Interrelations with other Massive Stars in Galaxies, 379–84. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3306-7_70.
Full textClegg, R. E. S. "PN Abundances in Different Galactic Systems." In Planetary Nebulae, 549–56. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-2088-3_249.
Full textConference papers on the topic "Nebular abundances"
Frankowski, Adam. "Binary CSPN and PN Abundances." In PLANETARY NEBULAE AS ASTRONOMICAL TOOLS: International Conference on Planetary Nebulae as Astronomical Tools. AIP, 2005. http://dx.doi.org/10.1063/1.2146266.
Full textLeisy, P. "Local Group Galaxies: Abundances in NGC 3109." In PLANETARY NEBULAE AS ASTRONOMICAL TOOLS: International Conference on Planetary Nebulae as Astronomical Tools. AIP, 2005. http://dx.doi.org/10.1063/1.2146291.
Full textTsamis, Yiannis. "Elemental Abundances in PNe and H II Regions: Lessons in Parallel." In PLANETARY NEBULAE AS ASTRONOMICAL TOOLS: International Conference on Planetary Nebulae as Astronomical Tools. AIP, 2005. http://dx.doi.org/10.1063/1.2146225.
Full textWerner, Klaus. "Light and Heavy Metal Abundances in Hot Central Stars of Planetary Nebulae." In PLANETARY NEBULAE AS ASTRONOMICAL TOOLS: International Conference on Planetary Nebulae as Astronomical Tools. AIP, 2005. http://dx.doi.org/10.1063/1.2146248.
Full textMaciel, W. J. "Planetary Nebulae as a Chemical Evolution Tool: Abundance Gradients." In PLANETARY NEBULAE AS ASTRONOMICAL TOOLS: International Conference on Planetary Nebulae as Astronomical Tools. AIP, 2005. http://dx.doi.org/10.1063/1.2146285.
Full textStasińska, G. "Abundance Gradients in M33: the Use of Planetary Nebulae." In PLANETARY NEBULAE AS ASTRONOMICAL TOOLS: International Conference on Planetary Nebulae as Astronomical Tools. AIP, 2005. http://dx.doi.org/10.1063/1.2146290.
Full textLorente-Espin, O. "Abundance Analysis of a Sample of Bipolar Type I Planetary Nebulae." In PLANETARY NEBULAE AS ASTRONOMICAL TOOLS: International Conference on Planetary Nebulae as Astronomical Tools. AIP, 2005. http://dx.doi.org/10.1063/1.2146227.
Full textWalsh, Jeremy R., George H. Jacoby, Reynier F. Petetier, and Nicholas A. Walton. "Using planetary nebulae as abundance probes of galaxies." In Astronomical Telescopes and Instrumentation, edited by Jacqueline Bergeron. SPIE, 2000. http://dx.doi.org/10.1117/12.390136.
Full textPeña, M. "Using Planetary Nebulae to Analyze the Abundance Gradient in the Milky Way." In PLANETARY NEBULAE AS ASTRONOMICAL TOOLS: International Conference on Planetary Nebulae as Astronomical Tools. AIP, 2005. http://dx.doi.org/10.1063/1.2146284.
Full textTorres-Peimbert, Silvia. "Chemical composition of planetary nebulae: The abundance discrepancy problem." In INTERNATIONAL CONFERENCE OF COMPUTATIONAL METHODS IN SCIENCES AND ENGINEERING 2015 (ICCMSE 2015). AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4937639.
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