Title:	Timing and spectral studies of the Transient X-Ray Pulsar EXO 053109-6609.2 with ASCA and BeppoSAX
Authors:	Paul, Biswajit Jaaffrey, S.N.A. Naik, S. Agrawal, P.C.
Issue Date:	Feb-2004
Publisher:	IOP Publishing Ltd.
Citation:	Astronomy and Astrophysics, 2004, Vol. 602, p913-917
Abstract:	We report timing and spectral properties of the transient Be X-ray pulsar EXO 053109-6609.2, which was studied using observations made with the ASCA and BeppoSAX observatories. Although there must have been at least one spin-down episode of the pulsar since its discovery, the new pulse-period measurements show a monotonic spin-up trend since 1996. The pulse profile is found to have marginal energy dependence. There is also evidence for strong luminosity dependence of the pulse profile, which has a single-peaked profile at low luminosity that changes to a double-peaked profile at high luminosity. This suggests a change in the accretion pattern at certain luminosity levels. The X-ray spectrum is found to consist of a simple power law with a photon index in the range of 0.4-0.8. At high intensity levels the spectrum also shows the presence of a weak iron emission line.
Description:	Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
URI:	http://hdl.handle.net/2289/4973
ISSN:	0004-637X 1538-4357 (Online)
Alternative Location:	http://adsabs.harvard.edu/abs/2004ApJ...602..913P http://arxiv.org/abs/astro-ph/0402127 http://dx.doi.org/10.1086/381161
Copyright:	2004 The American Astronomical Society
Appears in Collections:	Research Papers (A&A)

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