用TESS探测AQ Men的倾斜吸积盘
Exploring the tilted accretion disc of AQ Men with TESS
摘要：
AQ Men是一颗类似新星的变星，被认为有一个倾斜的旋进吸积盘。在这个系统中的掠食被推测是有用的探索其吸积盘的几何形状。在这项工作中，我们分析了AQ Men的TESS观测，它提供了迄今为止该物体的最佳光变曲线。我们发现，食的深度随着吸积盘的方向而变化，这意味着它们可以作为倾斜吸积盘模型的直接测试。在TESS观测期间，吸积盘的进动周期在增加。然而，它仍然比以前研究中确定的时间短。与吸积盘进动相关的变化幅度不同，这种变化的形状也不同。此外，我们还发现了一个以前在AQ Men中看不到的正超级峰。有趣的是，正超峰有一个强烈的非正弦形状，这是不期望的新星样变量。
英文摘要：
AQ Men is a nova-like variable which is presumed to have a tilted, precessing accretion disc. Grazing eclipses in this system have been speculated to be useful in exploring the geometry of its accretion disc. In this work we analysed TESS observations of AQ Men, which provide the best light curve of this object thus far. We show that the depths of the eclipses are changing with the orientation of the accretion disc, which means that they can serve as a direct test of the tilted accretion disc models. The precession period of the accretion disc is increasing during the TESS observations. However, it is still shorter than the period determined in the previous studies. The amplitude of the variability related to the precession of the accretion disc varies, and so does the shape of this variability. Moreover, we have detected a positive superhump that was previously unseen in AQ Men. Interestingly, the positive superhump has a strongly non-sinusoidal shape, which is not expected for a nova-like variable.
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