非同步极区V1432 Aql的剩余食通量和食定时的周期性变化：移动穿线区的证据
Periodic Variations in the Residual Eclipse Flux and Eclipse Timings of Asynchronous Polar V1432 Aql: Evidence of a Shifting Threading Region
摘要：
我们报告的结果，为期28个月的测光活动研究V1432 Aql，唯一已知的日食，异步极地。我们的数据表明，剩余的日食流量和日食O-C的时间变化强烈的自旋轨道拍周期的函数。依赖于一个新的系统模型，我们表明，沿吸积流的弹道轨迹的线程区域的位置的周期性变化可以产生这两种效果。该模型预测，螺纹半径是可变的，在以前的研究中，假设一个恒定的螺纹半径。此外，我们确定了一个非常强的光度最大值，它只在节拍周期的一半可见。这个最大值的确切原因尚不清楚，但我们认为它可能是Rana等人（2005）提出的第三个吸积极帽的光学对应物。最后，白矮星自转周期的变化率与自转周期和轨道周期之差成正比，这意味着自转周期渐近地接近轨道周期。
英文摘要：
We report the results of a twenty-eight-month photometric campaign studying V1432 Aql, the only known eclipsing, asynchronous polar. Our data show that both the residual eclipse flux and eclipse O-C timings vary strongly as a function of the spin-orbit beat period. Relying upon a new model of the system, we show that cyclical changes in the location of the threading region along the ballistic trajectory of the accretion stream could produce both effects. This model predicts that the threading radius is variable, in contrast to previous studies which have assumed a constant threading radius. Additionally, we identify a very strong photometric maximum which is only visible for half of the beat cycle. The exact cause of this maximum is unclear, but we consider the possibility that it is the optical counterpart of the third accreting polecap proposed by Rana et al. (2005). Finally, the rate of change of the white dwarf's spin period is consistent with it being proportional to the difference between the spin and orbital periods, implying that the spin period is approaching the orbital period asymptotically.
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