SIMBAD references

2006ApJ...652.1240K - Astrophys. J., 652, 1240-1245 (2006/December-1)

The chemical evolution of helium in globular clusters: implications for the self-pollution scenario.

KARAKAS A.I., FENNER Y., SILLS A., CAMPBELL S.W. and LATTANZIO J.C.

Abstract (from CDS):

We investigate the suggestion that there are stellar populations in some globular clusters with enhanced helium (Y∼0.28-0.40) 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.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: Globular Clusters: General - Stars: Abundances - Stars: AGB and Post-AGB - Stars: Chemically Peculiar

Simbad objects: 9

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