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DeSSpOt: an instrument for stellar spin orientation determination

机译：DeSSpOt：确定恒星自旋方向的仪器

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We designed and constructed a special instrument to enable the determination of the stellar's spin orientation. TheDifferential image rotator for Stellar Spin Orientation, DeSSpOt, allows the simultaneous observations of two anti-parallelorientations of the star on the spectrum. On a high resolution ´echelle spectrum, the stellar rotation causes a slight line tiltvisible in the spatial direction which is comparable to a rotation curve. We developed a new method, which exploits thevariations in these tilts, to estimate the absolute position angle of the rotation axis. The line tilt is retrieved by a spectroastrometricextraction of the spectrum.In order to validate the method, we observed spectroscopic binaries with known orbital parameters. The determination ofthe 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 Coud´e spectrograph of the Th¨uringer LandessternwarteTautenburg. The observations of Capella led to the determination of the orbital position angle. Our value of 37.2° is inagreement with the values previously found in the literature. As such we verified that both method and instrument are valid.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
机译：我们设计并构造了一种特殊的仪器，可以确定恒星的旋转方向。用于恒星自旋取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取向。在高分辨率的埃切尔光谱上，恒星旋转会导致在空间方向上可见的轻微倾斜线，这可与旋转曲线相提并论。我们开发了一种利用这些倾斜度变化的新方法来估计旋转轴的绝对位置角。通过光谱的光谱学提取来提取线倾斜。为了验证该方法，我们观察了具有已知轨道参数的光谱双星。轨道位置角的确定与恒星位置角的确定相同，但更易于检测。DeSSpOt在Thuringer LandessternwarteTautenburg的高分辨率Coud'e光谱仪上成功实现。 Capella的观测导致确定了轨道位置角。我们的值为37.2°与先前文献中发现的价值观不一致。因此，我们验证了方法和仪器都是有效的。©（2012）COPYRIGHT光电仪器工程师协会（SPIE）。摘要的下载仅允许个人使用。

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