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arXiv 0806.1973astro-ph
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通过IGR +0951的恒星风与INTEGRAL/RXTE同时观测

Peering through the stellar wind of IGR J19140+0951 with simultaneous INTEGRAL/RXTE observations

L. Prat, J. Rodriguez, D. C. Hannikainen, S. E. Shaw

摘要:

我们同时使用RXTE和INTEGRAL卫星对高质量X射线双星IGR J19140+0951进行了观测。在3- 80 keV范围内获得的光谱使我们能够沿其双星轨道对系统进行精确的光谱分析。光谱演化证实了伴星的超巨星性质和致密天体的中子星性质。用一个简单的恒星风模型来描述光电吸收的演化,我们能够将轨道倾角限制在38- 75度的范围内。这一分析得出伴星的风质量损失率约为5x 10 e-8 Msun/年,与OB I光谱类型一致。我们在至少四次观测中发现了软过剩,这是该来源的第一次。过去,在几个HMXB中已经报告了这种软过度。我们讨论了这种过剩的可能来源,并建议,根据其光谱特性和发生周围的优越的结合,它可以被解释为来自中子星周围的电离气体的X射线发射的再加工。

英文摘要:

We have used the RXTE and INTEGRAL satellites simultaneously to observe the High Mass X-ray binary IGR J19140+0951. The spectra obtained in the 3--80 keV range have allowed us to perform a precise spectral analysis of the system along its binary orbit. The spectral evolution confirms 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 in the range 38--75 degrees. This analysis leads to a wind mass-loss rate from the companion star of ~5x 10e-8 Msun/year, consistent with an OB I spectral type. We have detected a 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 around the superior conjunction, that it may be explained as the reprocessing of the X-ray emission originating from the neutron star by the surrounding ionised gas.

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