Multiple Outbursts of a Cataclysmic Variable in the Globular Cluster M22

Details Multiple Outbursts of a Cataclysmic Variable in the Globular Cluster M22 Multiple Outbursts of a Cataclysmic Variable in the Globular Cluster M22

2005-01-16

arxiv.org/abs/astro-ph/0501322v1

Astrophys.J. 620 (2005) L103-L106

Astronomy and Astrophysics

Astrophysics

12 pages, 4 figures, accepted for publication ApJ letters

Scientific paper

10.1086/428836

We present a 4 year light curve of a cataclysmic variable in M22, based on an analysis of accumulated data from the MOA microlensing survey. The position of the star coincides with that of a transient event observed by HST in 1999, originally attributed to microlensing but later suspected to be a dwarf nova outburst. Two outburst episodes, one in 2002 and one in 2003, with $\Delta I\sim3$ are seen in the MOA data thus confirming that the HST event was a dwarf nova outburst. The MOA and HST data show that this dwarf nova underwent at least three outburst episodes during 1999--2004. Further close monitoring of this event is encouraged as future outburst episodes are expected.

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