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

页码：983 / 990

页数：8

共 28 条

[1] Multicolor CCD photometry of the poorly studied globular cluster M80 [J].