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- W3124662007 abstract "High-precision multi-band Hubble Space Telescope (HST) photometry reveals that the main sequence of the globular cluster NGC 6397 splits into two components, containing ∼30% and ∼70% of the stars. This double sequence is consistent with the idea that the cluster hosts two stellar populations: (1) a primordial population that has a composition similar to field stars, containing ∼30% of the stars, and (2) a second generation with enhanced sodium and nitrogen, depleted carbon and oxygen, and a slightly enhanced helium abundance (ΔY ∼ 0.01). We examine the color difference between the two sequences across a variety of color baselines and find that the second sequence is anomalously faint in mF336W. Theoretical isochrones indicate that this could be due to NH depletion." @default.
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- W3124662007 date "2011-12-28" @default.
- W3124662007 modified "2023-09-28" @default.
- W3124662007 title "A DOUBLE MAIN SEQUENCE IN THE GLOBULAR CLUSTER NGC 6397" @default.
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- W3124662007 doi "https://doi.org/10.1088/0004-637x/745/1/27" @default.
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