Blue straggler stars: The spectacular population in M80

被引：120
|
作者：
Ferraro, FR
Paltrinieri, B
Rood, RT
Dorman, B
机构：
[1] European So Observ, D-85748 Garching, Germany
[2] Osservatorio Astron Bologna, I-40127 Bologna, Italy
[3] Univ La Sapienza, Inst Astron, I-00185 Rome, Italy
[4] Univ Virginia, Dept Astron, Charlottesville, VA 22903 USA
[5] Raytheon STX, Greenbelt, MD 20771 USA
[6] NASA, Goddard Space Flight Ctr, Astron & Solar Phys Lab, Greenbelt, MD 20771 USA
来源：
ASTROPHYSICAL JOURNAL | 1999年 / 522卷 / 02期
关键词：
blue stragglers; globular clusters : individual (M80); stars : evolution; ultraviolet : stars;
D O I：
10.1086/307700
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Using Hubble Space Telescope WFPC2 observations in two ultraviolet (UV) filters (F225W and F336W) of the central region of the high-density Galactic globular cluster (GGC) M80, we have identified 305 blue straggler stars (BSS), which represents the largest and most concentrated population of BSS ever observed in a GGC. We also identify the largest clean sample of evolved BSS yet found. The high stellar density alone cannot explain the BSS, and we suggest that in M80 we are witnessing a transient dynamical state, during which stellar interactions are delaying the core-collapse process leading to an exceptionally large population of collisional BSS.
引用
收藏
页码：983 / 990
页数：8
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