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The M 4 Core Project with HST -II. Multiple stellar populations at the bottom of the main sequence

Milone, Antonino; Marino, Anna; Bedin, L R; Piotto, G; Cassisi, S; Dieball, A; Anderson, Jay; Jerjen, Helmut; Asplund, Martin; Bellini, A; Brogaard, Karsten; Dotter, Aaron; Giersz, M; Heggie, D C; Knigge, C.; Buonanno, R


The M 4 Core Project with HST is designed to exploit the Hubble Space Telescope (HST) to investigate the central regions of M 4, the Globular Cluster closest to the Sun. In this paper we combine optical and near-infrared photometry to study multiple stellar populations in M4.We detected two sequences of M-dwarfs containing ~38 per cent (MSI) and ~62 per cent (MSII) of MS stars below the main-sequence (MS) knee. We compare our observations with those of NGC 2808, which is the only other GCs...[Show more]

CollectionsANU Research Publications
Date published: 2014
Type: Journal article
Source: Monthly Notices of the Royal Astronomical Society
DOI: 10.1093/mnras/stu030
Access Rights: Open Access


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