大灾变变星的 TESS 光曲线。IV.食古新变星和类新变星的综合视图

Albert Bruch
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摘要

Transiting Exoplanet Survey Telescope(TESS)太空任务从 Ritter & Kolb 星表中选取了 48 个食古新星和新星变星(通常称为 NLs),主要根据其长达数月的 2 分钟时间分辨率光变曲线对这些系统的一些基本特性进行了综合分析。轨道上的变星表现出很大的多样性。从文献中获取的数据以及从 TESS 和 AAVSO 光曲线中测量到的许多额外的日食纪元被用来更新 21 个目标的轨道星历表。其中大部分目标的周期变化都超出了目前的理论理解。我们构建了轨道波形,并在可能的情况下研究了它们随时间的变化,发现了一些共同的特征,但也发现了各个系统之间的巨大差异。日食深度与日食外通量的关系表明,在所有系统中,造成日食外变化的部分光源都逃逸了,可能位于外盘区域。在出现超跳的系统中,日食宽度和纪元都随吸积盘的前摄周期而变化。这表明食光源会膨胀和收缩,其光心也会随吸积盘的前摄周期而发生周期性移动。还研究了轨道波形和超冲波形对磁盘前冲相位的依赖关系,但没有得出一致的结论。新发现两个大灾变变星正在发生食变。提请注意一些目标恒星的特殊性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
TESS Light Curves of Cataclysmic Variables. IV. A Synoptic View of Eclipsing Old Novae and Novalike Variables
Based mainly on the months-long 2 minutes time-resolution light curves observed by the Transiting Exoplanet Survey Telescope (TESS) space mission of 48 eclipsing old novae and novalike variables (commonly referred to as NLs) selected from the Ritter & Kolb catalog, a synoptic view of some basic properties of these systems is provided. The supraorbital variations exhibit a large diversity of behavior. Data taken from the literature and many additional eclipse epochs measured in the TESS and in AAVSO light curves are used to update the orbital ephemerides of 21 targets. The large majority of these suffer period variations which defy current theoretical understanding. Orbital waveforms are constructed and, if possible, their variation over time is studied, revealing some common characteristics but also substantial differences between individual systems. The dependence of the eclipse depth on the out-of-eclipse flux reveals that in all systems a fraction of the light source responsible for the out-of-eclipse variations escapes eclipse and is probably located in the outer disk regions. In systems exhibiting superhumps, both eclipse width and epoch are modulated with the accretion disk precession period. This suggests an expansion and contraction of the eclipsed light source, as well as a periodic shift of its light center as a function of the accretion disk precession phase. The dependence of the orbital and superhump waveforms on the disk precession phase is also examined but does not lead to a consistent picture. Two cataclysmic variables are newly identified as eclipsing. Attention is drawn to specific peculiarities in some of the target stars.
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