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Evolutionary effects in helium core burning star atmospheres ; Evoliuciniai cheminės sudėties pokyčiai helį centre deginančių žvaigždžių atmosferose

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VILNIUS UNIVERSITY Eduardas Puzeras EVOLUTIONARY EFFECTS IN HELIUM CORE BURNING STAR ATMOSPHERES Doctoral Dissertation Physical sciences, Physics (02 P) Vilnius, 2011 Doctoral Dissertation was completed during 2002-2010 at Institute of Theoretical Physics and Astronomy, Vilnius University Scientific supervisor: Dr. habil. Gražina Tautvaišienė (Institute of Theoretical Physics and Astronomy, Vilnius University, Physical sciences, Physics – 02 P) VILNIAUS UNIVERSITETAS Eduardas Puzeras EVOLIUCINIAI CHEMINĖS SUDĖTIES POKYČIAI HELĮ CENTRE DEGINANČIŲ ŽVAIGŽDŽIŲATMOSFEROSE Daktaro disertacija Fiziniai mokslai, Fizika (02 P) Vilnius, 2011 Disertacija rengta 2002-2010 metais Vilniaus Universiteto Teorinės Fizikos ir Astronomijos Institute Mokslinis vadovas: Habil. Dr. Gražina Tautvaišienė (Vilniaus Universiteto Teorinės Fizikos ir Astronomijos Institutas, Fiziniai mokslai, Fizika – 02 P) CONTENTS PUBLICATIONS ON THE SUBJECT OF THE DISSERTATION ........... 7PRESENTATIONS AT INTERNATIONAL CONFERENCES ................. 8INTRODUCTION .......................................................................................... 10Mixing processes....................................................................................... 11Extra mixing .............................................................................................. 12Stellar abundances in a context of Galactic studies .................................. 13The Galactic red clump ....

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Publié par
Publié le 01 janvier 2011
Nombre de lectures 77
Poids de l'ouvrage 1 Mo
VILNIUS UNIVERSITY
Eduardas Puzeras
EVOLUTIONARY EFFECTS IN HELIUM CORE BURNING STAR ATMOSPHERES 
Doctoral Dissertation Physical sciences, Physics (02 P)
Vilnius, 2011
Doctoral Dissertation was completed during 2002-2010 at Institute of Theoretical
Physics and Astronomy, Vilnius University
Scientific supervisor:
Dr. habil. Gražina Tautvaišienė (Institute of Theoretical Physics and Astronomy,
Vilnius University, Physical sciences, Physics – 02 P)
VILNIAUS UNIVERSITETAS
Eduardas Puzeras
EVOLIUCINIAI CHEMINĖS SUDĖTIES POKYČIAI HELĮCENTRE DEGINANČIŲŽVAIGŽDŽIŲ ATMOSFEROSE 
Daktaro disertacija Fiziniai mokslai, Fizika (02 P)
Vilnius, 2011
Disertacija rengta 2002-2010 metais Vilniaus Universiteto Teorinės Fizikos ir Astronomijos Institute
Mokslinis vadovas:
Habil. Dr. Gražina Tautvaišienė (Vilniaus Universiteto Teorinės Fizikos ir Astronomijos Institutas, Fiziniai mokslai, Fizika – 02 P)
CONTENTS
PUBLICATIONS ON THE SUBJECT OF THE DISSERTATION ........... 7 PRESENTATIONS AT INTERNATIONAL CONFERENCES ................. 8 INTRODUCTION .......................................................................................... 10 Mixing processes ....................................................................................... 11 Extra mixing .............................................................................................. 12 Stellar abundances in a context of Galactic studies .................................. 13 The Galactic red clump ............................................................................. 13 AIMS OF THE STUDY........................................................................................ 14 THE MAIN TASKS.............................................................................................. 15 SCIENTIFIC NOVELTY....................................................................................... 15 PRACTICAL IMPORTANCE OF THE DISSERTATION.............................................. 16 STATEMENTS PRESENTED FOR DEFENSE.......................................................... 16 PERSONAL CONTRIBUTION.............................................................................. 17 THESIS OUTLINE.............................................................................................. 18 1. OBSERVATIONAL DATA.................................................................... 19 1.1. SELECTION OFGALACTIC CLUMP STARS............................................... 19 1.2. CLUSTER SELECTION............................................................................ 20 1.3. OBSERVATIONS.................................................................................... 21 1.3.1. Observations on the Nordic Optical Telescope .......................... 21 1.3.2. Other spectra............................................................................... 22 2. METHOD OF ANALYSIS ..................................................................... 24 2.1. DIFFERENTIAL MODEL ATMOSPHERE TECHNIQUE................................. 24 2.1.1. Main atmospheric parameters..................................................... 24 2.1.2. Stellar atmosphere models.......................................................... 25 2.1.3. Software of calculations ............................................................. 25 2.1.4. Physical input data...................................................................... 26 2.2. SPECTRAL LINE SELECTION AND MEASUREMENT................................... 27 2.3. SPECTRUM SYNTHESIS.......................................................................... 29 2.4. ESTIMATION OF UNCERTAINTIES........................................................... 31 3. GALACTIC CLUMP POPULATION IN THE SOLAR NEIGHBORHOOD ........................................................................................ 34 3.1. ATMOSPHERIC PARAMETERS AND ELEMENT ABUNDANCES.................... 35 3.2. COMPARISON WITH RESULTS BYMCWILLIAM(1990) ............................ 37 3.3. COMPARISON WITH RESULTS BYZHAO ET AL. (2001) ............................ 38 3.4. COMPARISON WITH RECENT STUDIES.................................................... 39 3.5. METALLICITY DISTRIBUTION IN CLUMP STARS OF THEGALAXY.............. 43 3.6. ABUNDANCES OF IRON GROUP ELEMENTS............................................ 46
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4. EVOLUTIONARY EFFECTS IN CLUMP STARS............................ 48 4.1. COMPARISONS WITHC, NANDOABUNDANCES IN DWARF STARS.......... 48 4.2. C, N, OABUNDANCE DISTRIBUTIONS.................................................... 52 4.3. COMPARISONS WITH THEORETICAL MODELS......................................... 52 5. OPEN CLUSTER NGC 7789 ................................................................. 56 5.1. GENERAL PARAMETERS OFNGC 7789 ................................................. 56 5.2. ABUNDANCES OFNGC 7789 ............................................................... 57 5.3. COMPARISON WITH PREVIOUS STUDIES................................................ 59 5.4. CARBON,NITROGEN AND OXYGEN........................................................ 62 5.5. SODIUM ANDALUMINIUM.................................................................... 64 5.6.ΑLPHAELEMENTS: MG, SI, CA ANDTI................................................. 65 5.7. IRON GROUP AND HEAVIER ELEMENTS.................................................. 66 5.8. FINAL REMARKS................................................................................... 67 RESULTS AND CONCLUSIONS ................................................................ 69 Galactic clump: main parameters, iron group abundances and metallicity distribution................................................................................................. 69 Galactic clump: mixing processes ............................................................. 69 Chemical composition of the open cluster NGC 7789.............................. 70 ACKNOWLEDGEMENTS ........................................................................... 71 REFERENCES................................................................................................ 72
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PUBLICATIONS ON THE SUBJECT OF THE DISSERTATION
1. Tautvaišienė G., Edvardsson B.,Puzeras E., Barisevičius G., Ilyin I. 2010,C, N and O abundances in red clump stars of the Milky Way// Monthly Notices of Royal Astronomical Society, 409, 1213–1219. 2.Puzeras E., Tautvaišienė Cohen J. G., Gray D. F., Adelman S. J., G., Ilyin I., Chorniy Y. 2010,High–resolution spectroscopic study of red clump stars in the Galaxy: iron–group elements // Monthly Notices of Royal Astronomical Society, 408, 1225 1232. 3. Tautvaišienė G.,Puzeras E., Chorniy Y., Barisevicius G., Ilyin I. 2009, CNO abundance pattern in the red clump stars of the Milky Way // IAU Symposium 262, „Stellar populations: Planning for the next decade“ (eds.Gustavo Bruzual & Stephane Charlot), IAUS, 262, 434-435. 4. TautvaišienėG.,Puzeras E.2009,Red clump stars in the Galactic field// IAU Symposium 254, „The Galaxy Disk in Cosmological Context“ (eds. J. Andersen, J. Bland-Hawthorn & Birgitta Nordström), IAUS, 254, 1-6. 5. Tautvaišienė, G, Mikolaitis, Š.,Puzeras E. 2009,E–infrastructure in Baltic States and its Application in Astrophysics Memorie della Società // Astronomica Italiana, 80, 534-539. 6. TautvaišienėG., Edvardsson B.,Puzeras E., Ilyin I. 2007,Abundances of C, N and O as Probes of Mixing in Low–Mass Helium–Core Burning Stars// IAU Symposium 239, “Convection in Astrophysics“ (eds. F. Kupka, I. W. Roxburgh & K. Lam Chan), IAUS, 239, 301-303. 7. TautvaišienėG., Edvardsson B.,Puzeras E., Stasiukaitis E., Ilyin I. 2006, Chemical abundances and mixing in red clump stars of the Galaxy // ESO– Arcetri Workshop „Chemical abundances and mixing in stars in the Milky Way and its satellites“ (eds. S. Randich, L. Pasquini), ESO ASTROPHYSICS SYMPOSIA, Springer-Verlag, 11–12.
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