The chemical evolution of subpopulations in the Carina dwarf spheroidal

Koch, Andreas and Wilkinson, M. and Grebel, E. K. and Harbeck, Daniel and Kleyna, Jan and Wyse, Rosemary F. G. and Gilmore, G. and Evans, N. W. (2005) The chemical evolution of subpopulations in the Carina dwarf spheroidal. Proceedings of the International Astronomical Union, 1 (C198). pp. 134-138. ISSN 1743-9213

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We present the observed metallicity distribution for 437 red giants in the Carina dwarf spheroidal (dSph) galaxy that was derived from FLAMES medium-resolution spectroscopy of the near-infrared Ca triplet (CaT). We find a mean [Fe/H] of −1.7, dex and a full spread in metallicities of at least one dex. Most of this width is due to the occurrence of three populations at different [Fe/H], which are likely to be related to the three star forming (SF) episodes that governed Carina's evolution and also correlate with peaks in the age-distribution. Both the lack of any correlation between stellar colour and metallicity and a comparison of the metallicities with chemical evolution models, which suggest a major role of infalling gas, contribute to the detailed understanding of Carina's evolutionary history. Moreover, we find a mild dependence of metallicity on radial location, reflected in a shift of the distribution's peak towards the metal poor end in the outer regions.

Item Type: Journal Article
Journal or Publication Title: Proceedings of the International Astronomical Union
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/3100/3103
Departments: Faculty of Science and Technology > Physics
ID Code: 83664
Deposited By: ep_importer_pure
Deposited On: 15 Dec 2016 15:00
Refereed?: No
Published?: Published
Last Modified: 01 Jan 2020 10:08

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