The Chemical Evolution of Helium in Globular Clusters: Implications for the Self-Pollution Scenario
Astrophysics
2008-11-26 v1
Abstract
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.
Keywords
Cite
@article{arxiv.astro-ph/0608366,
title = {The Chemical Evolution of Helium in Globular Clusters: Implications for the Self-Pollution Scenario},
author = {Amanda Karakas and Yeshe Fenner and Alison Sills and Simon Campbell and John Lattanzio},
journal= {arXiv preprint arXiv:astro-ph/0608366},
year = {2008}
}
Comments
accepted for publication in ApJ