Far-ultraviolet imaging of the globular cluster NGC 7099 with the second wide-field and planetary camera

被引：7
|
作者：
Mould, JR
Watson, AM
Gallagher, JS
Ballester, GE
Burrows, CJ
Casertano, S
Clarke, JT
Crisp, D
Griffiths, RE
Hester, JJ
Hoessel, JG
Holtzman, JA
Scowen, PA
Stapelfeldt, KR
Trauger, JT
Westphal, JA
机构：
[1] NEW MEXICO STATE UNIV,DEPT ASTRON,LAS CRUCES,NM 88003
[2] UNIV WISCONSIN,DEPT ASTRON,MADISON,WI 53706
[3] UNIV MICHIGAN,DEPT ATMOSPHER & OCEAN SCI,ANN ARBOR,MI 48109
[4] SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218
[5] JOHNS HOPKINS UNIV,DEPT ASTRON,BALTIMORE,MD 21218
[6] CALTECH,JET PROP LAB,PASADENA,CA 91109
[7] ARIZONA STATE UNIV,DEPT PHYS & ASTRON,TEMPE,AZ 85287
[8] CALTECH,DIV GEOL & PLANETARY SCI,PASADENA,CA 91125
来源：
ASTROPHYSICAL JOURNAL | 1996年 / 461卷 / 02期
关键词：
globular clusters; individual; (NGC; 7099); stars; evolution; horizontal-branch; ultraviolet;
D O I：
10.1086/177100
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We have imaged the globular cluster NGC 7099 in the far-UV and visible with WFPC2 on the Hubble Space Telescope. Our far-UV images show a sparsely populated and fully resolved central region. The far-UV to visible color-magnitude diagram of these stars shows a well-defined horizontal branch with no evidence for hot, more evolved descendants. We find one hot horizontal branch star; the center of the cluster harbors four luminous blue stragglers. Far-UV images do not show any singularly steep density gradient at small radii among the horizontal branch stars of this post-core-collapse cluster.
引用
收藏
页码：762 / &
页数：6
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