Homogeneous photometry for star clusters and resolved galaxies. I. A survey of bright stars in the Fornax dwarf spheroidal galaxy

被引:151
作者
Stetson, PB
Hesser, JE
Smecker-Hane, TA
机构
[1] Dominion Astrophys Observ, Herzberg Inst Astrophys, Natl Res Council, Victoria, BC V8X 4M6, Canada
[2] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA
关键词
D O I
10.1086/316164
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present accurate photometry on the Johnson B, Kron-Cousins R photometric system for approximately 100,000 stars in a 1/3 deg(2) field centered on the dwarf spheroidal galaxy in Fornax. We identify numerous probable short-period variable stars, blue stars that appear to be the main sequence of a small population with an age of order 10(8) yr, and two distinct types of luminous red star: an extended sequence of primarily carbon stars and a clump of mostly M giants slightly more luminous than the giant-branch tip. The spatial distribution of each of these subpopulations within the Fornax dwarf galaxy is considered.
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页码:533 / 552
页数:20
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