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

页码：L113 / L116

页数：4

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