The Age-Metallicity Relation of the SMC

Details The Age-Metallicity Relation of the SMC The Age-Metallicity Relation of the SMC

2006-07-04

arxiv.org/abs/astro-ph/0607047v1

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, to appear in the proceedings of "Globular Clusters - Guides to Galaxies", Concepcion, Chile, March 6th-10t

Scientific paper

The Small Magellanic Cloud (SMC) is the only dwarf galaxy in the Local Group known to have formed and preserved populous star clusters continuously over the past 12 Gyr. These clusters provide a unique, closely spaced set of single-age, single-metallicity tracers for a detailed study of the SMC's age-metallicity relation. Spectroscopic metallicity measurements, however, exist only for 6 of its clusters. Here we present metallicities for 7 additional SMC clusters based on Ca II triplet observations. The total sample comprises clusters spanning an age range of 12 Gyr. Complemented by age estimates from literature these objects provide us with a well-sampled, well-defined age-metallicity relation. We compare our first results with the chemical evolution history of the SMC in terms of a simple closed box model. We find that the general trend is well reproduced by this model.

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