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Theoretical stellar ΔY/ΔO in the early Universe

Published online by Cambridge University Press:  23 April 2010

Sylvia Ekström ,
Georges Meynet ,
André Maeder ,
Cristina Chiappini ,
Cyril Georgy  and
Raphael Hirschi
Sylvia Ekström
Affiliation:
Astronomical Observatory of the Geneva University, Maillettes 51 - Sauverny, 1290 Versoix GE, Switzerland email: Sylvia.Ekstrom@unige.ch
Georges Meynet
Affiliation:
Astronomical Observatory of the Geneva University, Maillettes 51 - Sauverny, 1290 Versoix GE, Switzerland email: Sylvia.Ekstrom@unige.ch
André Maeder
Affiliation:
Astronomical Observatory of the Geneva University, Maillettes 51 - Sauverny, 1290 Versoix GE, Switzerland email: Sylvia.Ekstrom@unige.ch
Cristina Chiappini
Affiliation:
Astronomical Observatory of the Geneva University, Maillettes 51 - Sauverny, 1290 Versoix GE, Switzerland email: Sylvia.Ekstrom@unige.ch Osservatorio Astronomico di Trieste, OAT/INAF, Via G. B. Tiepolo 11, 34131 Trieste TS, Italy
Cyril Georgy
Affiliation:
Astronomical Observatory of the Geneva University, Maillettes 51 - Sauverny, 1290 Versoix GE, Switzerland email: Sylvia.Ekstrom@unige.ch
Raphael Hirschi
Affiliation:
Astrophysics group, Keele University, Lennard-Jones Lab., Keele, ST5 5BG, UK IPMU, University of Tokyo, Kashiwa, Chiba 277-8582, Japan
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Abstract

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Population III stars initiated the chemical enrichment of the Universe. Chemical evolution models seem to favour fast rotators among the very low-metallicity population. When a star rotates fast, it ejects significant quantities of He and its nucleosynthesic products are modified compared to the case without rotation. The value of ΔY/ΔO is explored from a theoretical point of view through stellar models of zero- or very low-metallicity.

Keywords

nucleosynthesisstars: rotationearly universe
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S268: Light Elements in the Universe , November 2009 , pp. 447 - 452
Copyright
Copyright © International Astronomical Union 2010

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