The Chemical Evolution of Helium in Globular Clusters: Implications for the Self‐Pollution Scenario | Zendy

Amanda I. Karakas | Zendy; Yeshe Fenner | Zendy; Alison Sills | Zendy; S. W. Campbell | Zendy; John C. Lattanzio | Zendy

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

Author(s) -

Amanda I. Karakas,

Yeshe Fenner,

Alison Sills,

S. W. Campbell,

John C. Lattanzio

Publication year - 2006

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/508504

Subject(s) - globular cluster , asymptotic giant branch , helium , physics , stars , astrophysics , horizontal branch , initial mass function , cluster (spacecraft) , pollution , atomic physics , star formation , biology , computer science , programming language , ecology

We investigate the suggestion that there are stellar populations in someglobular clusters with enhanced helium (Y from 0.28 to 0.40) compared to theprimordial value. We assume that a previous generation of massive AsymptoticGiant Branch (AGB) stars have polluted the cluster. Two independent sets of AGByields are used to follow the evolution of helium and CNO using a Salpeterinitial mass function (IMF) and two top-heavy IMFs. In no case are we able toproduce the postulated large Y ~ 0.35 without violating the observationalconstraint that the CNO content is nearly constant.Comment: accepted for publication in Ap

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