Chemical Abundances in the Carina dSph Galaxy

Despina Hatzidimitriou (Univ. of Crete); Dominion Astrophys. Obs.); Georgi I. Mandushev (Univ. of California; G. S. Da Costa (Australia National Univ.); Herzberg Inst. of Astrophys.; Irvine); James E. Hesser; Peter B. Stetson (Nat. Res. Council of Canada; Tammy A. Smecker-Hane

arxiv: astro-ph/9910212 · v1 · submitted 1999-10-12 · 🌌 astro-ph

Chemical Abundances in the Carina dSph Galaxy

Tammy A. Smecker-Hane , Georgi I. Mandushev (Univ. of California , Irvine) , James E. Hesser , Peter B. Stetson (Nat. Res. Council of Canada , Herzberg Inst. of Astrophys. , Dominion Astrophys. Obs.) , G. S. Da Costa (Australia National Univ.)

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Despina Hatzidimitriou (Univ. of Crete)

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keywords carinaabundanceschemicaldsphstarsgalaxymetallicityaccuracy

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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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Chemical Abundances in the Carina dSph Galaxy

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