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Helium-rich stars in globular clusters: constraints for self-enrichment by massive stars

Decressin, Thibaut ; Meynet, G. ; Charbonnel, C.

In: Proceedings of the International Astronomical Union, 2009, vol. 5, no. S268, p. 135-140

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    Titre
    • Helium-rich stars in globular clusters: constraints for self-enrichment by massive stars
    Auteur
    • Decressin, Thibaut. Argelander Institute for Astronomy (AIfA), Auf dem Hügel 71, D-53121 Bonn, Germany email: decressin@astro.uni-bonn.de
    • Meynet, G.. Geneva Observatory, University of Geneva, 51 ch. des Maillettes, 1290 Versoix, Switzerland email: georges.meynet@unige.ch
    • Charbonnel, C.. Geneva Observatory, University of Geneva, 51 ch. des Maillettes, 1290 Versoix, Switzerland email: georges.meynet@unige.ch
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Proceedings of the International Astronomical Union, 2009, vol. 5, no. S268, p. 135-140. Cambridge University Press
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:290495
    Summary
    Globular clusters exhibit peculiar chemical patterns where Fe and heavy elements are constant inside a given cluster while light elements (Li to Al) show strong star-to-star variations. This pattern can be explained by self-pollution of the intracluster gas by the slow winds of fast rotating massive stars. Besides, several main sequences have been observed in several globular clusters which can be understood only with different stellar populations with distinct He content. Here we explore how these He abundances can constrain the self-enrichment in globular clusters