The age of the Sculptor dwarf spheroidal galaxy from imaging with WFPC2

被引:48
|
作者
Monkiewicz, J
Mould, JR
Gallagher, JS
Clarke, JT
Trauger, JT
Grillmair, C
Ballester, GE
Burrows, CJ
Crisp, D
Evans, R
Griffiths, R
Hester, JJ
Hoessel, JG
Holtzman, JA
Krist, JE
Meadows, V
Scowen, PA
Stapelfeldt, KR
Sahai, R
Watson, A
机构
[1] Australian Natl Univ, Mt Stromlo & Siding Spring Observ, Inst Adv Studies, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
[2] Univ Wisconsin, Dept Astron, Madison, WI 53706 USA
[3] Univ Michigan, Dept Atmospher Ocean & Space Sci, Ann Arbor, MI 48109 USA
[4] Jet Propuls Lab, Pasadena, CA 91109 USA
[5] CALTECH, IPAC, Pasadena, CA 91125 USA
[6] Space Telescope Sci Inst, Baltimore, MD 21218 USA
[7] Carnegie Mellon Univ, Dept Phys, Pittsburgh, PA 15213 USA
[8] Arizona State Univ, Dept Phys & Astron, Tempe, AZ 85287 USA
[9] New Mexico State Univ, Dept Astron, Las Cruces, NM 88003 USA
[10] Univ Nacl Autonoma Mexico, Astron Inst, Morelia 58090, Michoacan, Mexico
关键词
D O I
10.1086/316447
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
From images taken with the Hubble Space Telescope's WFPC2, we have obtained photometry of a field in the Sculptor dwarf spheroidal galaxy to 3 mag below the main-sequence turnoff. We determine an age equal to that of the earliest globular clusters for the bulk of the stars in our field of view. We attempt to constrain the star formation history of the Sculptor dwarf by examining the main-sequence luminosity function. The presence of a half-dozen blue straggler candidates blueward of the turnoff points to a possibly complex star formation history. However, the contribution of any intermediate-age population is difficult to measure conclusively, because of the uncertain origin of blue stragglers and the sparseness of the photometric sample.
引用
收藏
页码:1392 / 1397
页数:6
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