Stellar populations and variable stars in the core of the globular cluster M5

被引：17

作者：

Drissen, L ^{[1
]}

Shara, MM

机构：

[1] Univ Laval, Dept Phys, Ste Foy, PQ G1K 7P4, Canada

[2] Univ Laval, Observatoire Mont Megant, Ste Foy, PQ G1K 7P4, Canada

[3] Space Telescope Sci Inst, Baltimore, MD 21218 USA

来源：

ASTRONOMICAL JOURNAL | 1998年 / 115卷 / 02期

关键词：

blue stragglers; globular clusters; individual; (M5); RR Lyrae variable;

D O I：

10.1086/300197

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of a variable blue straggler in the core of the globular cluster M5, based on a 12 hr-long series of images obtained with the Planetary Camera aboard the Hubble Space Telescope. In addition, we present the light curves of 28 previously unknown or poorly studied large-amplitude variable stars (all but one are RR Lyrae stars) in the cluster core. A (V, U-I) color-magnitude diagram shows 24 blue stragglers within 2 core radii of the cluster center. The blue straggler population is significantly more centrally concentrated than the horizontal-branch and red giant stars.

引用

页码：725 / 733

页数：9

共 25 条

[1] CANADA-FRANCE-HAWAII-TELESCOPE OBSERVATIONS OF GLOBULAR-CLUSTER CORES - BLUE STRAGGLER STARS IN M3 (NGC-5272, GC-1339+286) [J].