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The double sub-giant branch of NGC 6656 (M 22): A chemical characterization

Asplund, Martin; Marino, Anna F; Milone, A. P.; Sneden, Chris; Bergemann, Maria; Kraft, R. P.; Wallerstein, G; Cassisi, S; Aparicio, Antonio; Hilker, M; Lind, Karin


We present an abundance analysis of 101 subgiant branch (SGB) stars in the globular cluster M 22. Using low-resolution FLAMES/GIRAFFE spectra we have determined abundances of the neutron-capture strontium and barium and the light element carbon. With these data we explore relationships between the observed SGB photometric split in this cluster and two stellar groups characterized by different contents of iron, slow neutron-capture process (s-process) elements, and the α element calcium, which...[Show more]

CollectionsANU Research Publications
Date published: 2012
Type: Journal article
Source: Astronomy and Astrophysics
DOI: 10.1051/0004-6361/201118381
Access Rights: Open Access


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