DeSSpOt：一种测定恒星自旋方位的仪器
DeSSpOt: an instrument for stellar spin orientation determination
摘要：
我们设计并建造了一个特殊的仪器来确定恒星的自旋方向。恒星自旋方向的差分图像旋转器，DeSSpOt，允许在光谱上同时观测恒星的两个反平行方向。在高分辨率的埃歇勒光谱上，恒星的自转会导致在空间方向上可见的轻微的线倾斜，这与自转曲线相当。我们开发了一种新的方法，利用这些倾斜的变化，估计旋转轴的绝对位置角。通过光谱的光谱天文测量提取来检索线倾斜。为了验证该方法，我们观察到光谱双星已知的轨道参数。轨道位置角的确定与恒星位置角的确定相当，但更容易探测。DeSSpOt已成功应用于陶滕堡的高分辨率Coudé摄谱仪。五车二的观测结果导致了轨道位置角的确定。
英文摘要：
We designed and constructed a special instrument to enable the determination of the stellar's spin orientation. The Differential image rotator for Stellar Spin Orientation, DeSSpOt, allows the simultaneous observations of two anti-parallel orientations of the star on the spectrum. On a high resolution échelle spectrum, the stellar rotation causes a slight line tilt visible in the spatial direction which is comparable to a rotation curve. We developed a new method, which exploits the variations in these tilts, to estimate the absolute position angle of the rotation axis. The line tilt is retrieved by a spectro-astrometric extraction of the spectrum. In order to validate the method, we observed spectroscopic binaries with known orbital parameters. The determination of the orbital position angle is equivalent to the determination of the stellar position angle, but is easier to to detect. DeSSpOt was successfully implemented on the high resolution Coudé spectrograph of the Thüringer Landessternwarte Tautenburg. The observations of Capella led to the determination of the orbital position angle.
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