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Title: Orbital phase spectroscopy of four high mass X-ray binary pulsars to study the stellar wind of the companion
Authors: Naik, S.
Mukherjee, U.
Paul, Biswajit
Chol, C.S.
Keywords: Pulsars: individual (4U 1538-52, GX 301-2, OAO 1657-415 and Vela X-1)
Stars: circumstellar matter
X-rays: stars
Issue Date: 16-Mar-2009
Publisher: Elsevier B.V.
Citation: Advances in Space Research, 2009, Vol. 43(6), p900-904
Abstract: Our work focuses on a comprehensive orbital phase-dependent spectroscopy of the four High Mass X-ray Binary Pulsars (HMXBPs) 4U 1538-52, GX 301-2, OAO 1657-415 and Vela X-1. We hereby report the measurements of the variation of the absorption column density and iron-line flux along with other spectral parameters over the binary orbit for the above-mentioned HMXBPs in elliptical orbits, as observed with the Rossi X-ray Timing Explorer (RXTE) and the BeppoSAX satellites. A spherically symmetric wind profile was used as a model to compare the observed column density variations. Out of the four pulsars, only in 4U 1538-52, we find the model having a reasonable corroboration with the observations, whereas in the remaining three the stellar wind seems to be clumpy and a smooth symmetric stellar wind model appears to be quite inadequate in explaining the data. Moreover, in GX 301-2, neither the presence of a disk nor a gas stream from the companion was validated. Furthermore, the spectral results obtained in the case of OAO 1657-415 and Vela X-1 were more or less similar to that of GX 301-2.
Description: Restricted Access. An open-access version is available at (one of the alternative locations)
ISSN: 0273-1177
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Copyright: 2008 COSPAR Published by Elsevier Ltd.
Appears in Collections:Research Papers (A&A)

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