The abundance spread in the boötes i dwarf spheroidal galaxy

John E. Norris, Gerard Gilmore, Rosemary F G Wyse, Mark I. Wilkinson, V. Belokurov, N. Wyn Evans, Daniel B. Zucker

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Abstract

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 (⊙≥107 M&o) normally assumed to foster self-enrichment and the production of chemical abundance spreads was provided by the nonbaryonic material in Boötes I.

Original languageEnglish
Pages (from-to)L113-L116
Number of pages4
JournalAstrophysical Journal
Volume689
Issue number2
DOIs
Publication statusPublished - 2008
Externally publishedYes

Bibliographical note

Erratum can be found in Astrophysical Journal, Volume 695(2), L217,
http://dx.doi.org/10.1088/0004-637X/695/2/L217

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    Norris, J. E., Gilmore, G., Wyse, R. F. G., Wilkinson, M. I., Belokurov, V., Evans, N. W., & Zucker, D. B. (2008). The abundance spread in the boötes i dwarf spheroidal galaxy. Astrophysical Journal, 689(2), L113-L116. https://doi.org/10.1086/595962, https://doi.org/10.1088/0004-637X/695/2/L217