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


Giles, AB and Greenhill, JG and Hill, KM and Sanders, E, The optical counterpart of XTE J0929-314: the third transient millisecond X-ray pulsar, Monthly Notices of the Royal Astronomical Society, 361, (4) pp. 1180-1186. ISSN 0035-8711 (2005) [Refereed Article]

DOI: doi: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 broad-band photometry on this object using the Mt Canopus 1-m telescope during May and June until it had faded to below 21st magnitude. Nearly continuous I-band CCD photometry on 2002 May 2-4 revealed a ∼10 per cent 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 hotspot on the disc and X-ray heating of the secondary. The emission generally trended bluer with B - I decreasing by 0.6 mag 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 broad-band photometry shows 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. © 2005 RAS.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Giles, AB (Dr Barry Giles)
UTAS Author:Greenhill, JG (Dr John Greenhill)
UTAS Author:Hill, KM (Dr Kym Hill)
UTAS Author:Sanders, E (Miss Ella Sanders)
ID Code:35573
Year Published:2005
Web of Science® Times Cited:14
Deposited By:Physics
Deposited On:2005-08-01
Last Modified:2006-03-29

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