Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2009-02-26
Astrophys.J.689:L113-L116,2008; Erratum-ibid.695:L217,2009
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
12 pages, 2 figures. Published in the Astrophysical Journal Letters. An erratum is in press and included here as an Appendix (
Scientific paper
10.1086/595962 10.1088/0004-637X
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 Delta [Fe/H] ~ 1.7 dex, with one star having [Fe/H] = -3.4. The dispersion is sigma([Fe/H]) = 0.45 +/- 0.08 -- similar to those of the Galaxy's more luminous dSph systems and Omega Centauri. This suggests that the large mass (greater than approximately 10 million solar masses) normally assumed to foster self-enrichment and the production of chemical abundance spreads was provided by the non-baryonic material in Bootes I.
Belokurov Vasily
Evans Wyn N.
Gilmore Gerard
Norris John. E.
Wilkinson Mark I.
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