Star clusters in M31. V. Evidence for self-enrichment in old M31 clusters from integrated spectroscopy

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DOIResolve DOI: http://doi.org/10.1088/2041-8205/776/1/L7
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TypeArticle
Journal titleThe Astrophysical Journal Letters
ISSN2041-8205
Volume776
Issue1
Article numberL7
AbstractIn the past decade, the notion that globular clusters (GCs) are composed of coeval stars with homogeneous initial chemical compositions has been challenged by growing evidence that they host an intricate stellar population mix, likely indicative of a complex history of star formation and chemical enrichment. Several models have been proposed to explain the existence of multiple stellar populations in GCs, but no single model provides a fully satisfactory match to existing data. Correlations between chemistry and global parameters such as cluster mass or luminosity are fundamental clues to the physics of GC formation. In this Letter, we present an analysis of the mean abundances of Fe, Mg, C, N, and Ca for 72 old GCs from the Andromeda galaxy. We show for the first time that there is a correlation between the masses of GCs and the mean stellar abundances of nitrogen, spanning almost two decades in mass. This result sheds new light on the formation of GCs, providing important constraints on their internal chemical evolution and mass loss history. © 2013. The American Astronomical Society. All rights reserved.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC)
Peer reviewedYes
NPARC number21270544
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Record identifierea07ae8b-2e3d-4da8-8957-295c7cf5092b
Record created2014-02-17
Record modified2016-07-18
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