Cluster AgeS Experiment (CASE): Detection of a dwarf nova in the globular cluster M55
arXiv:astro-ph/0502445 · doi:10.1111/j.1365-2966.2005.08940.x
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.
6 pages, 6 figures, accepted for publication in MNRAS