The Chemical Evolution of Helium in Globular Clusters: Implications for the Self-Pollution Scenario

Details The Chemical Evolution of Helium in Globular Clusters: Implications for the Self-Pollution Scenario The Chemical Evolution of Helium in Globular Clusters: Implications for the Self-Pollution Scenario

2006-08-17

arxiv.org/abs/astro-ph/0608366v1

Astrophys.J.652:1240-1245,2006

Astronomy and Astrophysics

Astrophysics

accepted for publication in ApJ

Scientific paper

10.1086/508504

We investigate the suggestion that there are stellar populations in some globular clusters with enhanced helium (Y from 0.28 to 0.40) compared to the primordial value. We assume that a previous generation of massive Asymptotic Giant Branch (AGB) stars have polluted the cluster. Two independent sets of AGB yields are used to follow the evolution of helium and CNO using a Salpeter initial mass function (IMF) and two top-heavy IMFs. In no case are we able to produce the postulated large Y ~ 0.35 without violating the observational constraint that the CNO content is nearly constant.

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