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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

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