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

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

2005-02-22

arxiv.org/abs/astro-ph/0502445v1

Mon.Not.Roy.Astron.Soc. 359 (2005) 677-682

Astronomy and Astrophysics

Astrophysics

6 pages, 6 figures, accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2005.08940.x

We report the detection of a dwarf nova (DN) in the core region of the globular cluster M55. Six outbursts were observed during 8 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 H-R 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.

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