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

Published online by Cambridge University Press:  23 April 2010

Thibaut Decressin ,
G. Meynet  and
C. Charbonnel
Thibaut Decressin
Affiliation:
Argelander Institute for Astronomy (AIfA), Auf dem Hügel 71, D-53121 Bonn, Germany email: decressin@astro.uni-bonn.de
G. Meynet
Affiliation:
Geneva Observatory, University of Geneva, 51 ch. des Maillettes, 1290 Versoix, Switzerland email: georges.meynet@unige.ch
C. Charbonnel
Affiliation:
Geneva Observatory, University of Geneva, 51 ch. des Maillettes, 1290 Versoix, Switzerland email: georges.meynet@unige.ch Laboratoire d'Astrophysique de Toulouse-Tarbes, CNRS UMR 5572, Université de Toulouse, 14 Av. E. Belin, 31400 Toulouse, France email: corinne.charbonnel@unige.ch
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Abstract

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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.

Keywords

stars: abundancesevolutionhorizontal-branchmass loss – globular clusters: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S268: Light Elements in the Universe , November 2009 , pp. 135 - 140
Copyright
Copyright © International Astronomical Union 2010

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