The donor star of the X-ray pulsar X1908+075
The donor star of the X-ray pulsar X1908+075
复制标题
X射线脉冲星X1908 075的供体星
DOI：
10.1051/0004-6361/201424823
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
W.-R. Hamann
中科院分区：
文献类型：
--
作者：
S. Martínez-Nunez;A. Sander;A. Gímenez-García;A. Gónzalez-Gálan;J. M. Torrejón;C. Gónzalez-Fernández;W.-R. Hamann
高质量X射线双星由一颗大质量的施主恒星和一颗致密天体组成。虽然这些系统中的几个已经在X射线中得到了很好的研究，但对于大多数捐赠恒星来说，人们知之甚少，因为它们经常在光学和紫外线区域被严重遮挡。然而，有机会在红外波长观察它们。这项研究的目的是利用恒星大气模型获得X1908+075大质量X射线双星系统中施主恒星的恒星和风参数，以检查之前从X射线观测和光谱形态方面的研究是否能够充分描述施主恒星。用波茨坦Wolf-Rayet(POWR)模式大气程序对X1908+075的H带和K带光谱进行了分析。首次计算了供体星的恒星大气模型，其主要参数为：MSpec=15±6M⊙，T∗=23-3+6kK，LOGGEF=3.0±0.2，LogL/L⊙=4.81±0.25。得到的参数指向一颗早期的B型(B0-B3)恒星，可能处于超巨星阶段。此外，我们还确定了比先前报道的更准确的系统距离4.85±0.50kpc。
High-mass X-ray binaries consist of a massive donor star and a compact object. While several of those systems have been well studied in X-rays, little is known for most of the donor stars as they are often heavily obscured in the optical and ultraviolet regime. There is an opportunity to observe them at infrared wavelengths, however. The goal of this study is to obtain the stellar and wind parameters of the donor star in the X1908+075 high-mass X-ray binary system with a stellar atmosphere model to check whether previous studies from X-ray observations and spectral morphology lead to a sufficient description of the donor star. We obtainedH- andK-band spectra of X1908+075 and analysed them with the Potsdam Wolf-Rayet (PoWR) model atmosphere code. For the first time, we calculated a stellar atmosphere model for the donor star, whose main parameters are:Mspec= 15 ± 6M⊙,T∗= 23-3+6kK, loggeff= 3.0 ± 0.2 and logL/L⊙= 4.81 ± 0.25. The obtained parameters point towards an early B-type (B0–B3) star, probably in a supergiant phase. Moreover we determined a more accurate distance to the system of 4.85 ± 0.50 kpc than the previously reported value.