Cluster AgeS Experiment (CASE): Detection of a dwarf nova in the globular cluster M55
J. Kaluzny, P. Pietrukowicz, I. B. Thompson, W. Krzeminski, A. Schwarzenberg-Czerny, W. Pych, G. Stachowski
Abstract
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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