Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-10-07
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
12 pages, 6 figures. Invited review, to appear in the proceedings of IAU Symp. 266 (ed. R. de Grijs & J. R. D. Lepine)
Scientific paper
Globular clusters have long been considered the closest approximation to a physicist's laboratory in astrophysics, and as such a near-ideal laboratory for (low-mass) stellar evolution. However, recent observations have cast a shadow on this long-standing paradigm, suggesting the presence of multiple populations with widely different abundance patterns, and -- crucially -- with widely different helium abundances as well. In this review we discuss which features of the Hertzsprung-Russel diagram may be used as helium abundance indicators, and present an overview of available constraints on the helium abundance in globular clusters.
Catelan Márcio
Sweigart Allen V.
Valcarce A. A. R.
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