论文标题
自从一系列低状态恢复以来
The Intermediate Polar FO Aquarii Has Not Been the Same Since Recovering from a Series of Low States
论文作者
论文摘要
FO AQR是一个明亮的中间极性，长期以来显示出与其白色矮人的20.9分钟旋转周期相对应的大幅度光度变化。在2016年至2020年之间，该系统遭受了一系列前所未有的低国家，但最近的数据表明，它现在已经恢复到正常的光亮度。我们比较了2014年K2/Kepler获得的光曲线与2021年获得的TESS任务的光度法。我们发现，2014年光曲线的主要特征的旋转脉冲现在在下半场二进制二进制轨道和TEST脉冲在Tess光学中增强了。现在在轨道的后半部分中看到了旋转频率的大约两倍的变化。现在，由于其白矮人已经开始旋转，这些光度法可能是FO AQR的新常态。
FO Aqr is a bright intermediate polar that has long displayed large amplitude photometric variations corresponding to the 20.9 min spin period of its white dwarf. Between 2016 and 2020, the system suffered a series of unprecedented low-states, but recent data shows that it has now recovered to its normal optical luminosity. We compare the light curves obtained by K2/Kepler in 2014 with photometry from the TESS mission obtained in 2021. We find that the spin pulse that had been the dominant feature of the light curve in 2014 is now weak over the second half the binary orbit and that a beat pulse is enhanced in the TESS photometry. Variations at approximately twice the spin frequency are now seen over the second half of the orbit. These photometric properties may be the new normal for FO Aqr now that its white dwarf has begun to spin down.
