天鹅座X-3沃尔夫-拉叶星风的Gemini/GNIRS红外光谱
Gemini/GNIRS infrared spectroscopy of the Wolf-Rayet stellar wind in Cygnus X-3
摘要：
微类星体天鹅座X-3在硬X射线状态下被双子座北红外光谱仪观测了几次。我们描述所观察到的1.0-2.4 $μ$ m光谱所产生的恒星风的伴星，并建议其分类为WN 4-6沃尔夫-拉叶星。我们属性的发射线轮廓的轨道变化的恒星风的电离结构的变化所造成的强烈的X射线发射从紧凑的对象。在谱线分布中观察到的强变异性将影响质量函数测定。我们无法重现早期的结果，从沃尔夫-拉叶星的质量函数推导出来。相反，我们认为，系统参数是很难获得的红外光谱。我们发现，近红外连续光谱和线光谱可以表示与非LTE沃尔夫-拉叶大气模型，如果考虑到所产生的影响，从独特的电离结构的恒星风以近似的方式。从代表性的模型中，我们推断沃尔夫-拉叶星的性质，并讨论可能的质量范围的二进制组件。
英文摘要：
The microquasar Cygnus X-3 was observed several times with the Gemini North Infrared Spectrograph while the source was in the hard X-ray state. We describe the observed 1.0-2.4 $μ$m spectra as arising from the stellar wind of the companion star and suggest its classification as a WN 4-6 Wolf-Rayet star. We attribute the orbital variations of the emission line profiles to the variations in the ionization structure of the stellar wind caused by the intense X-ray emission from the compact object. The strong variability observed in the line profiles will affect the mass function determination. We are unable to reproduce earlier results, from which the mass function for the Wolf-Rayet star was derived. Instead, we suggest that the system parameters are difficult to obtain from the infrared spectra. We find that the near-infrared continuum and the line spectra can be represented with non-LTE Wolf-Rayet atmosphere models if taking into account the effects arising from the peculiar ionization structure of the stellar wind in an approximative manner. From the representative models, we infer the properties of the Wolf-Rayet star and discuss possible mass ranges for the binary components.
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