The optical counterpart of XTE J0929-314, the third transient millisecond X-ray pulsar

Details The optical counterpart of XTE J0929-314, the third transient millisecond X-ray pulsar The optical counterpart of XTE J0929-314, the third transient millisecond X-ray pulsar

2005-06-14

arxiv.org/abs/astro-ph/0506295v1

Mon.Not.Roy.Astron.Soc. 361 (2005) 1180-1186

Astronomy and Astrophysics

Astrophysics

7 pages, 6 figures, accepted by MNRAS, 6 June 2005

Scientific paper

10.1111/j.1365-2966.2005.09255.x

A blue and variable optical counterpart of the X-ray transient XTE J0929-314 was identified on 2002 May 1. We conducted frequent BVRI broadband photometry on this object using the Mt Canopus 1-m telescope during May and June until it had faded to below 21'st magnitude. Nearly continuous I band CCD photometry on 2002 May 2, 3 and 4 revealed a ~ 10 % sinusoidal modulation at the binary period lasting ~ 6 cycles during the latter half of May 2. The phase indicates that the modulation may be due to a combination of emission by a hot spot on the disc and X-ray heating of the secondary. The emission generally trended bluer with B-I decreasing by 0.6 magnitudes during the observations but there were anomalous changes in colour during the first few days after optical identification when the I band flux decreased slightly while fluxes in other bands increased. Spectral analysis of the BVRI broadband photometry show evidence of a variable excess in the R and I bands. We suggest that this may be due to synchrotron emission in matter flowing out of the system and note that similar processes may have been responsible for anomalous V and I band measurements in 1998 of the persistent millisecond X-ray pulsar SAX J1808.4-3658.

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