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A double main sequence in the globular cluster NGC6397

Milone, Antonino; Marino, Anna; Piotto, G; Bedin, L R; Anderson, Jay; Aparicio, A; Cassisi, S; Rich, R M


High-precision multi-band Hubble Space Telescope (HST) photometry reveals that the main sequence of the globular cluster NGC6397 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...[Show more]

CollectionsANU Research Publications
Date published: 2012
Type: Journal article
Source: Astrophysical Journal, The
DOI: 10.1088/0004-637X/745/1/27
Access Rights: Open Access


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