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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/6916
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dc.contributor.authorDevasia, Jincy-
dc.contributor.authorPaul, Biswajit-
dc.date.accessioned2018-05-28T18:06:17Z-
dc.date.available2018-05-28T18:06:17Z-
dc.date.issued2018-02-
dc.identifier.citationJournal of Astrophysics and Astronomy, 2018, Vol.39, p7en_US
dc.identifier.issn0250-6335-
dc.identifier.issn0973-7758 (Online)-
dc.identifier.urihttp://hdl.handle.net/2289/6916-
dc.descriptionOpen Accessen_US
dc.description.abstractWe report results from analysis performed on an eclipsing supergiant high mass X-ray binary pulsar XTE J1855-026 observed with the X-ray Imaging Spectrometer (XIS) on-board Suzaku Observatory in April 2015. Suzaku observed this source for a total effective exposure of ∼87 ks just before an eclipse. Pulsations are clearly observed and the pulse profiles of XTE J1855-026 did not show significant energy dependence during this observation consistent with previous reports. The time averaged energy spectrum of XTE J1855-026 in the 1.0–10.5 keV energy range can be well fitted with a partial covering power law model modified with interstellar absorption along with a black-body component for soft excess and a gaussian for iron fluorescence line emision. The hardness ratio evolution during this observation indicated significant absorption of soft X-rays in some segments of the observation. For better understanding of the reason behind this, we performed time-resolved spectroscopy in the 2.5–10.5 keV energy band which revealed significant variations in the spectral parameters, especially the hydrogen column density and iron line equivalent width with flux. The correlated variations in the spectral parameters indicate towards the presence of clumps in the stellar wind of the companion star accounting for the absorption of low energy X-rays in some time segments.en_US
dc.language.isoenen_US
dc.publisherSpringer for Indian Academy of Sciencesen_US
dc.relation.urihttp://adsabs.harvard.edu/abs/2018JApA...39....7Den_US
dc.relation.urihttps://link.springer.com/article/10.1007/s12036-017-9496-zen_US
dc.rights2018 Indian Academy of Sciencesen_US
dc.subjectX-rayen_US
dc.subjectneutron starsen_US
dc.subjectXTE J1855-026en_US
dc.titleSuzaku observation of the eclipsing high mass X-ray binary pulsar XTE J1855-026.en_US
dc.typeArticleen_US
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