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Theoretical stellar ΔY/ΔO in the early Universe

Ekström, Sylvia ; Meynet, Georges ; Maeder, André ; Chiappini, Cristina ; Georgy, Cyril ; Hirschi, Raphael

In: Proceedings of the International Astronomical Union, 2009, vol. 5, no. S268, p. 447-452

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    Titre
    • Theoretical stellar ΔY/ΔO in the early Universe
    Auteur
    • Ekström, Sylvia. Astronomical Observatory of the Geneva University, Maillettes 51 - Sauverny, 1290 Versoix GE, Switzerland email: Sylvia.Ekstrom@unige.ch
    • Meynet, Georges. Astronomical Observatory of the Geneva University, Maillettes 51 - Sauverny, 1290 Versoix GE, Switzerland email: Sylvia.Ekstrom@unige.ch
    • Maeder, André. Astronomical Observatory of the Geneva University, Maillettes 51 - Sauverny, 1290 Versoix GE, Switzerland email: Sylvia.Ekstrom@unige.ch
    • Chiappini, Cristina. Astronomical Observatory of the Geneva University, Maillettes 51 - Sauverny, 1290 Versoix GE, Switzerland email: Sylvia.Ekstrom@unige.ch
    • Georgy, Cyril. Astronomical Observatory of the Geneva University, Maillettes 51 - Sauverny, 1290 Versoix GE, Switzerland email: Sylvia.Ekstrom@unige.ch
    • Hirschi, Raphael. Astrophysics group, Keele University, Lennard-Jones Lab., Keele, ST5 5BG, UK
    Type de document
    • Postprint
    Langue
    • Inglese
    Publié dans
    • Proceedings of the International Astronomical Union, 2009, vol. 5, no. S268, p. 447-452. Cambridge University Press
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:303880
    Summary
    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