The Double Subgiant Branch of NGC 1851: The Role of the CNO Abundance
The Double Subgiant Branch of NGC 1851: The Role of the CNO Abundance
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 α-enhanced component, and one characterized by strong anticorrelations among the CNONa abundances, …