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Global Clusters as Laboratories for Stellar Evolution (2010)

Valcarce, Aldo A. R. ; Catelan, Marcio ; Sweigart, Allen V.

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Publication Date: 2019-07-19

Description: 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-Russell diagram may be used as helium abundance indicators, and present an overview of available constraints on the helium abundance in globular clusters,

Keywords: Astronomy

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