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The C+N+O abundances and the splitting of the subgiant branch in the globular cluster NGC 1851

Ventura, P; Caloi, V; D'Antona, Francesca; Ferguson, Jason W; Milone, Antonino; Piotto, G


Among the newly discovered features of multiple stellar populations in globular clusters (GCs), the cluster NGC 1851 harbours a double subgiant branch (SGB), that can be explained in terms of two stellar generations, only slightly differing in age, the younger one having an increased total C+N+O abundance. Thanks to this difference in the chemistry, a fit can be made to the SGBes, roughly consistent with the C+N+O abundance variations already discovered two decades ago, and confirmed by recent...[Show more]

CollectionsANU Research Publications
Date published: 2009
Type: Journal article
Source: Monthly Notices of the Royal Astronomical Society
DOI: 10.1111/j.1365-2966.2009.15335.x


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