论文标题
Eclips Z cam + vy scl star ES DRA中的负超烟
Negative superhumps in the eclipsing Z Cam + VY Scl star ES Dra
论文作者
论文摘要
我分析了ES DRA的Supernovae（ASAS-SN）天空巡逻数据的全面自动化调查，并将其归类为具有VY SCL型褪色情节的Z CAM星。对过渡系外行星调查卫星（TESS）观测值的分析表明，该对象显示浅叶叶，轨道周期为0.17749895（17）d。在1月至3月之间的TESS数据中检测到负超超烟的负超烟，并且在负超烟和轨道时期之间的BEAT现象和轨道周期之间的BEAT现象。轨道曲线在某些阶段有系统地变化，具体取决于节拍阶段和日食。 ES DRA中的日食是放牧的，根据倾斜磁盘的方向，磁盘可能不会在某些阶段黯然失色。这些观察结果增加了对进攻，倾斜磁盘为负超烟的起源的解释。在VY SCL型褪色开始之前，负超烟雾消失了4 d。当负超烟消失时，质量转移率很可能很快下降，并且磁盘的总发光度的下降需要4 d。这提供了磁盘反应的时间尺度，以突然减少VY SCL恒星中的传质。尽管ES DRA中的停滞之一是通过增亮终止的，但ES DRA作为IW和Star的身份将需要进一步的事件。
I analyzed All-Sky Automated Survey for Supernovae (ASAS-SN) Sky Patrol data of ES Dra and classified it to be a Z Cam star with VY Scl-type fading episodes. An analysis of Transiting Exoplanet Survey Satellite (TESS) observations showed that this object shows shallow eclipses and that the orbital period is 0.17749895(17) d. Negative superhumps with a period of 0.167830(2) d and the beat phenomenon between the period of negative superhumps and the orbital period were detected in the TESS data between 2020 January and March. The orbital profile systematically varied depending on the beat phase and eclipses were missing in some phases. The eclipses in ES Dra were grazing and the disk was probably not eclipsed in some phases depending on the orientation of the tilted disk. These observations added a support to the interpretation of the precessing, tilted disk as the origin of negative superhumps. Negative superhumps disappeared 4 d before the VY Scl-type fading started. It was likely that the mass-transfer rate quickly dropped when negative superhumps disappeared and the decline of the total luminosity of the disk took 4 d. This provides a measurement of the time-scale of the response of the disk against a sudden decrease of the mass transfer in a VY Scl star. Although one of standstills in ES Dra was terminated by brightening, the identity of ES Dra as an IW And star would require further events.
