Wide field Imaging of the Sextans Dwarf Spheroidal Galaxy

被引：0
|
作者：
Pancino, E [1 ]
Bellazzini, M [1 ]
Ferraro, FR [1 ]
机构：
[1] Univ Bologna, Dipartimento Astron, I-40127 Bologna, Italy
来源：
OBSERVED HR DIAGRAMS AND STELLAR EVOLUTION: THE INTERPLAY BETWEEN OBSERVATIONAL CONSTRAINTS AND THEORY | 2002年 / 274卷
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中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present wide field multiband photometry of the very low surface brightness dwarf Spheroidal galaxy (dSph) Sextans. We have found convincing evidence for the presence of multiple stellar populations in this galaxy. In particular we discovered: (a) a Blue Horizontal Branch tail kinked over the instability strip; (b) a clearly bimodal distribution in color of the Red Giant Branch (RGB) stars and (c) a double RGB-bump. All these features suggest that (at least) two components are present in the old stellar population that dominates the galaxy: a main one with [Fe/H]similar to -1.8 and a minor component around [Fe/H]similar to -2.5. Similar evidence has been recently found by Majewski et al. (1999) for the Sculptor dwarf Spheroidal, suggesting that multiple star formation episodes are common also in the most nearby dSphs that ceased their star formation activity at very early epochs.(1)
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页码：421 / 424
页数：4
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