Discovery of Optical Bursts from MS1603.6+2600 = UW CrB

Details Discovery of Optical Bursts from MS1603.6+2600 = UW CrB Discovery of Optical Bursts from MS1603.6+2600 = UW CrB

2004-05-11

arxiv.org/abs/astro-ph/0405199v1

Astrophys.J. 608 (2004) L101-L104

Astronomy and Astrophysics

Astrophysics

Accepted for publication in ApJ Letters, 4 pages

Scientific paper

10.1086/422471

We report the discovery of several optical burst-like events from the low-mass X-ray binary MS1603.6+2600 (UW CrB). The events last for a few tens of seconds, exhibit a very fast rise and slow decay, and involve optical brightening of a factor of 2-3. The flares appear distinct from the lower level flickering and instead strongly resemble reprocessed type-I X-ray bursts as seen in a number of other neutron star low-mass X-ray binaries. In conjunction with the previously reported candidate X-ray burst, these confirm that the compact object in UW CrB is a neutron star. We examine the optical burst brightness and recurrence times and discuss how the nature of the system can be constrained. We conclude that the source is most likely an accretion disk corona source at an intermediate distance, rather than a nearby quiescent system or very distant dipper.

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