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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/4964
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dc.contributor.authorNaik, S.-
dc.contributor.authorPaul, Biswajit-
dc.date.accessioned2012-07-17T04:36:26Z-
dc.date.available2012-07-17T04:36:26Z-
dc.date.issued2003-04-
dc.identifier.citationAstronomy and Astrophysics, 2003, Vol. 401, p265-270en
dc.identifier.issn0004-6361-
dc.identifier.issn1432-0746 (Online)-
dc.identifier.urihttp://hdl.handle.net/2289/4964-
dc.descriptionOpen Accessen
dc.description.abstractWe present spectral variations of the binary X-ray pulsar LMC X-4 using the RXTE/PCA observations at different phases of its 30.5 day long super-orbital period. Only out of eclipse data were used for this study. During the high state of the super-orbital period of LMC X-4, the spectrum is well described by a high energy cut-off power-law with a photon index in the range of 0.7-1.0 and an iron emission line. In the low state, the spectrum is found to be flatter with power-law photon index in the range 0.5-0.7. A direct correlation is detected between the continuum flux in 7-25 keV energy band and the iron emission line flux. The equivalent width of the iron emission line is found to be highly variable during the low intensity state, whereas it remains almost constant during the high intensity state of the super-orbital period. It is observed that the spectral variations in LMC X-4 are similar to those of Her X-1 (using RXTE/PCA data). These results suggest that the geometry of the region where the iron line is produced and its visibility with respect to the phase of the super-orbital period is similar in LMC X-4 and Her X-1. A remarkable difference between these two systems is a highly variable absorption column density with phase of the super-orbital period that is observed in Her X-1 but not in LMC X-4.en
dc.language.isoenen
dc.publisherEDP Sciencesen
dc.relation.urihttp://adsabs.harvard.edu/abs/2003A%26A...401..265Nen
dc.relation.urihttp://arxiv.org/abs/astro-ph/0301208en
dc.relation.urihttp://dx.doi.org/10.1051/0004-6361:20030111en
dc.rights2003 EDP Sciencesen
dc.titleSpectral variations of the X-ray binary pulsar LMC X-4 during its long period intensity variation and a comparison with Her X-1en
dc.typeArticleen
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