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The double subgiant branch of NGC 1851: The role of the CNO abundance

Cassisi, S; Salaris, M; Pietrinferni, A; Piotto, G; Milone, Antonino; Bedin, L R; Anderson, J


We explore the possibility that the anomalous split in the subgiant branch (SGB) of the Galactic globular cluster NGC 1851 is due to the presence of two distinct stellar populations with very different initial metal mixtures: a normal a-enhanced component, and one characterized by strong anticorrelations among the CNONa abundances, with a total CNO abundance increased by a factor of 2. We test this hypothesis taking into account various empirical constraints, and conclude that the two...[Show more]

CollectionsANU Research Publications
Date published: 2008
Type: Journal article
Source: Astrophysical Journal, The
DOI: 10.1086/527035


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