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.
@article{arxiv.astro-ph/0502445,
title = {Cluster AgeS Experiment (CASE): Detection of a dwarf nova in the globular cluster M55},
author = {J. Kaluzny and P. Pietrukowicz and I. B. Thompson and W. Krzeminski and A. Schwarzenberg-Czerny and W. Pych and G. Stachowski},
journal= {arXiv preprint arXiv:astro-ph/0502445},
year = {2009}
}
Comments
6 pages, 6 figures, accepted for publication in MNRAS