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Globular clusters as laboratories for stellar evolution

Published online by Cambridge University Press:  18 January 2010

Márcio Catelan ,
Aldo A. R. Valcarce  and
Allen V. Sweigart
Márcio Catelan
Affiliation:
Pontificia Universidad Católica de Chile, Departamento de Astronomía y Astrofísica, Av. Vicuña Mackenna 4860, 782-0436 Macul, Santiago, Chile email: mcatelan@astro.puc.cl, avalcarc@astro.puc.cl
Aldo A. R. Valcarce
Affiliation:
Pontificia Universidad Católica de Chile, Departamento de Astronomía y Astrofísica, Av. Vicuña Mackenna 4860, 782-0436 Macul, Santiago, Chile email: mcatelan@astro.puc.cl, avalcarc@astro.puc.cl
Allen V. Sweigart
Affiliation:
NASA Goddard Space Flight Center, Exploration of the Universe Division, Code 667, Greenbelt, MD 20771, USA email: allen.v.sweigart@nasa.gov
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Abstract

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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.

Keywords

Hertzsprung–Russell diagramstars: abundancesstars: evolutionstars: Population IIglobular clusters: general

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