期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 672, 期 2, 页码 L115-L118出版社
IOP PUBLISHING LTD
DOI: 10.1086/527035
关键词
globular clusters : individual (NGC 1851); Hertzsprung-Russell diagram stars : abundances; stars : evolution
资金
- Science and Technology Facilities Council [PP/E001149/1] Funding Source: researchfish
- STFC [PP/E001149/1] Funding Source: UKRI
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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