Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 672, Issue 2, Pages L115-L118Publisher
IOP PUBLISHING LTD
DOI: 10.1086/527035
Keywords
globular clusters : individual (NGC 1851); Hertzsprung-Russell diagram stars : abundances; stars : evolution
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Funding
- Science and Technology Facilities Council [PP/E001149/1] Funding Source: researchfish
- STFC [PP/E001149/1] Funding Source: UKRI
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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 alpha-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 populations should be approximately coeval, with the same initial He content. More high-resolution spectroscopic measurements of heavy elements - and in particular of the CNO sum - for this cluster are necessary to prove (or disprove) this scenario.
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