The first orbital solution for the massive colliding-wind binary HD 93162 (≡WR 25)
The first orbital solution for the massive colliding-wind binary HD 93162 (≡WR 25)
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大型碰撞风双星 HD 93162 (≡WR 25) 的第一个轨道解
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
G. Solivella
中科院分区：
文献类型：
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作者：
R. Gamen;E. Gosset;N. Morrell;V. Niemela;H. Sana;H. Sana;Y. Nazé;G. Rauw;R. H. Barbá;G. Solivella
上下文自从爱因斯坦卫星发现HD 93162（HDWR 25）的强X射线辐射以来，人们一直预测该天体是一个碰撞风双星系统。然而，径向速度的变化，将证明可疑的二元性质尚未发现。我们用光谱法监测了这个物体，以研究其可能的变化，以解决这种不一致性。方法.我们为这颗星星编制了最大的径向速度数据集，以寻找可能由双星运动引起的变化。我们主要从1994年至2006年获得的光谱数据中获得径向速度，并使用不同的数值方法搜索这些径向速度的周期性。结果这是第一次检测到周期性的径向速度变化。我们的分析明确地表明，沃尔夫-拉叶星星WR 25是一个偏心双星系统，其周期约为208天。
Context. Since the discovery, with the EINSTEIN satellite, of strong X-ray emission associated with HD 93162 ( ≡ WR 25), this object has been predicted to be a colliding-wind binary system. However, radial-velocity variations that would prove the suspected binary nature have yet to be found. Aims. We spectroscopically monitored this object to investigate its possible variability to address this discordance. Methods. We compiled the largest available radial-velocity data set for this star to look for variations that might be due to binary motion. We derived radial velocities from spectroscopic data acquired mainly between 1994 and 2006, and searched these radial velocities for periodicities using different numerical methods. Results. For the first time, periodic radial-velocity variations are detected. Our analysis definitively shows that the Wolf-Rayet star WR 25 is an eccentric binary system with a probable period of about 208 days.