Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-11-24
Astronomy and Astrophysics
Astrophysics
12 pages, 2 figures, ApJ Letter in press
Scientific paper
10.1086/527035
We explore the possibility that the anomalous split in the Subgiant branch 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 alpha-enhanced component, and one characterized by strong anticorrelations among the CNONa abundances, with a total CNO abundance increased by a factor of two. We test this hypothesis taking into account various empirical constraints, and conclude that the two populations should be approximately coeval, with the same initial He-content. More high-resolution spectroscopical measurements of heavy elements -- and in particular of the CNO sum -- for this cluster are necessary to prove (or disprove) this scenario.
Anderson Jeffrey
Bedin Luigi R.
Cassisi Santi
Milone Antonino P.
Pietrinferni Adriano
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