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Title:
Peering through the stellar wind of IGR J19140+0951 using RXTE and INTEGRAL observations
Authors:
Prat, L.; Rodriguez, J.; Hannikainen, D. C.
Publication:
SF2A-2008: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: C. Charbonnel, F. Combes and R. Samadi. Available online at http://proc.sf2a.asso.fr, p.273
Publication Date:
11/2008
Origin:
AUTHOR
Bibliographic Code:
2008sf2a.conf..273P

Abstract

IGR J19140+0951 was discovered by the satellite INTEGRAL in 2003. This is a High Mass X-ray binary, in which the compact object is deeply embedded in the wind coming from the supergiant companion star. Due to the high level of photoelectric absorption, this type of source couldn't be detected without hard X-rays observations. The spectra obtained in the 3-80 keV range using RXTE and INTEGRAL have allowed us to perform a precise spectral analysis of the system along its binary orbit. We were able to confirm the supergiant nature of the companion star and the neutron star nature of the compact object. Using a simple stellar wind model to describe the evolution of the photoelectric absorption, we were able to restrict the orbital inclination angle to the range 37-75°. Finally, we have detected a so-called "soft excess" in at least four observations, for the first time for this source. Such soft excesses have been reported in several HMXBs in the past. We discuss the possible origin of this excess, and suggest, based on its spectral properties and occurrences close to the superior conjunction, that it may be explained as the reprocessing of the X-ray emission originating from the neutron star by the surrounding ionized gas.
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