Cluster Ages Experiment (CASE): Detection of a dwarf nova in the globular cluster M55

被引：15
作者：
Kaluzny, J
Pietrukowicz, P
Thompson, IB
Krzeminski, W
Schwarzenberg-Czerny, A
Pych, W
Stachowski, G
机构：
[1] Nicolaus Copernicus Astron Ctr, PL-00716 Warsaw, Poland
[2] Carnegie Inst Sci, Pasadena, CA 91101 USA
[3] Campanas Observ, La Serena, Chile
[4] Adam Mickiewicz Univ, Astron Observ, PL-61286 Poznan, Poland
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2005年 / 359卷 / 02期
关键词：
stars : dwarf novae; novae; cataclysmic variables; globular clusters : individual : M55; globular clusters : individual : NGC 6809;
D O I：
10.1111/j.1365-2966.2005.08940.x
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We report the detection of a dwarf nova (DN) in the core region of the globular cluster M55. Six outbursts were observed during eight observing seasons spanning the period 1997-2004. The variable has an X-ray counterpart detected on images taken with the ROSAT telescope. Although we cannot offer proof of cluster membership, one can see that both the position on the Hertzsprung-Russell diagram and the X-ray flux are consistent with a bright DN at the cluster distance. According to our outburst statistics, no more than one similar DN could remain undetected in our field of view, centred at the cluster core.
引用
收藏
页码：677 / 682
页数：6
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