金牛座T星RW御夫座A的潮汐破裂盘掩星
Occultation of the T Tauri Star RW Aurigae A by its Tidally Disrupted Disk
摘要：
RW Aur A是一颗经典的金牛座T型恒星，被认为是由于它的伴星RW Aur B最近飞掠而导致其星周环境的重新配置。这种相互作用剥离了RW Aur A的一部分环星盘，留下了一个潮汐中断的臂和一个短截的环星盘。我们目前的光度观测的RW Aur系统从千度极小望远镜（KELT）的调查显示，从2010年9月到2011年3月发生了长期和深调光。这次变暗的深度约为2等，持续时间约为180天，并被美国变星观测者协会（AAVSO）的档案观测所证实。我们认为，这一事件的结果是一部分的潮汐破裂盘掩盖RW Aur A，特别是一个片段的潮汐破裂臂。计算的横向线速度的掩星与测量的相对径向速度的潮汐破裂臂是非常一致的。使用简单的运动学和几何参数，我们表明，掩星不能是一个功能的RW Aur A拱星盘，我们会考虑其他的假设我们还对遮蔽恒星的臂的厚度和半长轴进行了限制。
英文摘要：
RW Aur A is a classical T Tauri star, believed to have undergone a reconfiguration of its circumstellar environment as a consequence of a recent fly-by of its stellar companion, RW Aur B. This interaction stripped away part of the circumstellar disk of RW Aur A, leaving a tidally disrupted arm and a short truncated circumstellar disk. We present photometric observations of the RW Aur system from the Kilodegree Extremely Little Telescope (KELT) survey showing a long and deep dimming that occurred from September 2010 until March 2011. The dimming has a depth of ~2 magnitudes, a duration of ~180 days and was confirmed by archival observations from American Association of Variable Star Observers (AAVSO). We suggest that this event is the result of a portion of the tidally disrupted disk occulting RW Aur A, specifically a fragment of the tidally disrupted arm. The calculated transverse linear velocity of the occulter is in excellent agreement with the measured relative radial velocity of the tidally disrupted arm. Using simple kinematic and geometric arguments, we show that the occulter cannot be a feature of the RW Aur A circumstellar disk, and we consider and discount other hypotheses. We also place constraints on the thickness and semi-major axis of the portion of the arm that occulted the star.
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