Soft excess and orbital evolution studies of X-ray pulsars with BeppoSAX

Paul, Biswajit; Naik, S.; Bhatt, N.

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/4975

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DC Field	Value	Language
dc.contributor.author	Paul, Biswajit	-
dc.contributor.author	Naik, S.	-
dc.contributor.author	Bhatt, N.	-
dc.date.accessioned	2012-07-17T04:49:34Z	-
dc.date.available	2012-07-17T04:49:34Z	-
dc.date.issued	2004-06	-
dc.identifier.citation	Nuclear Physics B - Proceedings Supplement, 2004, Vol.132, p548-553	en
dc.identifier.issn	0920-5632	-
dc.identifier.uri	http://hdl.handle.net/2289/4975	-
dc.description	Restricted Access	en
dc.description.abstract	We present here a spectral study of two accreting binary X-ray pulsars LMC X-4 and SMC X-1 made with the BeppoSAX observatory. The energy spectrum of both the pulsars in 0.1-10.0 keV band can be described by a model consisting of a hard power-law component, a soft excess and an iron emission line at 6.4 keV. In addition, the power-law component of SMC X-1 also has an exponential cutoff at ~ 6 keV. Pulse-phase resolved spectroscopy confirms a pulsating nature of the soft spectral component in both the pulsars, with a certain phase offset compared to the hard power-law component. A dissimilar pulse profile of the two spectral components and a phase difference between the pulsating soft and hard spectral components are evidence for their different origins. In another study of an accreting binary X-ray pulsar Her X-1, we have made accurate measurements of new mid-eclipse times from pulse arrival time delays using observations made with the BeppoSAX and RXTE observatories. The new measurements, combined with the earlier reported mid-eclipse times are used to investigate orbital evolution of the binary. The most recent observation indicates deviation from a quadratic trend coincident with an anomalous low X-ray state, observed for the second time in this pulsar.	en
dc.language.iso	en	en
dc.publisher	Elsevier B.V.	en
dc.relation.uri	http://adsabs.harvard.edu/abs/2004NuPhS.132..548P	en
dc.relation.uri	http://dx.doi.org/10.1016/j.nuclphysbps.2004.04.092	en
dc.rights	2004 Elsevier B.V.	en
dc.title	Soft excess and orbital evolution studies of X-ray pulsars with BeppoSAX	en
dc.type	Article	en
Appears in Collections:	Research Papers (A&A)

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