THE ABUNDANCE SPREAD IN THE BOOTES I DWARF SPHEROIDAL GALAXY

被引：63
|
作者：
Norris, John E. [1 ]
Gilmore, Gerard [2 ]
Wyse, Rosemary F. G. [3 ]
Wilkinson, Mark I. [2 ,4 ]
Belokurov, V. [2 ]
Evans, N. Wyn [2 ]
Zucker, Daniel B. [2 ]
机构：
[1] Australian Natl Univ, Mt Stromlo Observ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
[2] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England
[3] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA
[4] Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England
来源：
ASTROPHYSICAL JOURNAL LETTERS | 2008年 / 689卷 / 02期
基金：
英国科学技术设施理事会;
关键词：
galaxies: abundances; galaxies: dwarf; galaxies: individual (Bootes I);
D O I：
10.1086/595962
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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] similar to 0.3, the abundance range in the sample is Delta[Fe/H] similar to 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 or similar to 10(7) M-circle dot) normally assumed to foster self-enrichment and the production of chemical abundance spreads was provided by the nonbaryonic material in Bootes I.
引用
收藏
页码：L113 / L116
页数：4
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