Chemical Abundances in the Carina dSph Galaxy

Details Chemical Abundances in the Carina dSph Galaxy Chemical Abundances in the Carina dSph Galaxy

1999-10-12

arxiv.org/abs/astro-ph/9910212v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, to appear in in "Spectro-Photometric Dating of Stars and Galaxies", eds. I. Hubeny, S. Heap & R. Cornett,

Scientific paper

We report on the chemical abundances of stars in the Carina dwarf spheroidal galaxy (dSph) derived from low-resolution spectra. We have determined values of [Fe/H] for 52 stars from the reduced equivalent width of the Ca II infrared triplet lines. The Carina dSph has a mean metallicity of [Fe/H] = -1.99 +/- 0.08 and an intrinsic metallicity dispersion 0.25 dex (1 sigma). By directly determining the chemical abundances of Carina stars through spectroscopy, we can overcome the age-metallicity degeneracy inherent in color-magnitude diagrams (CMDs) and determine its star-formation history with unprecedented accuracy.

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