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The Abundance Spread in the Bootes I Dwarf Spheroidal Galaxy

Norris, John; Gilmore, Gerard; Wyse, Rosemary F G; Wilkinson, M I; Belokurov, Vasily; Evans, N W; Zucker, Daniel B.

Description

We present medium-resolution spectra of 16 radial velocity red-giant members of the low-luminosity Bootes I dwarf spheroidal (dSph) galaxy that have sufficient S/N for abundance determination, based on the strength of the Ca ii K line. Assuming [Ca/Fe]-0.3, the abundance range in the sample is Δ[Fe/H]-1.7 dex, with one star having [Fe/H]=-3.4. The dispersion is σ([Fe/H])=0.45 ± 0.08-similar to those of the Galaxy's more luminous dSph systems and ω Centauri. This suggests that the large mass...[Show more]

CollectionsANU Research Publications
Date published: 2008
Type: Journal article
URI: http://hdl.handle.net/1885/33443
Source: Astrophysical Journal, The
DOI: 10.1086/595962

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