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The most plausible explanation of the cyclical period changes in close binaries: the case of the RS CVn-type binary WW Dra

机译：关于周期性变化的最合理的解释是近在咫尺   二进制：Rs CVn型二进制WW Dra的情况

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We searched the orbital period changes in 182 EA-type (including the 101Algol systems used by \cite{hal89}), 43 EB-type and 53 EW-type binaries withknown both the mass ratio and the spectral type of their secondary components.We reproduced and improved the same diagram as Hall's (1989) according to thenew collected data. Our plots do not support the conclusion derived by\cite{hal89} that all cases of cyclical period changes are restricted tobinaries having the secondary component with spectral types later than F5. Thepresence of period changes also among stars with secondary component of earlytype indicates that the magnetic activity is one cause, but not the only one,for the period variation. It is discovered that cyclic period changes, likelydue to the presence of a third body are more frequent in EW-type binaries amongclose binaries. Therefore, the most plausible explanation of the cyclicalperiod changes is the LTTE via the presence of a third body. By using thecentury-long historical record of the times of light minimum, we analyzed thecyclical period change in the Algol binary WW Dra. It is found that the orbitalperiod of the binary shows a $\sim112.2 \textbf{\textrm{yr}}$ cyclic variationwith an amplitude of $\sim0.1977\textbf{\textrm{days}}$. The cyclic oscillationcan be attributed to the LTTE via a third body with a mass no less than $6.43M_{\odot}$. However, no spectral lines of the third body were discoveredindicating that it may be a candidate black hole. The third body is orbitingthe binary at a distance shorter than 14.4 AU and it may play an important rolein the evolution of this system.
机译：我们搜索了182 EA型（包括\ cite {hal89}使用的101Algol系统），43 EB型和53 EW型双星的轨道周期变化，它们的次级成分的质量比和光谱类型均已知。根据新收集的数据，复制并改进了与Hall（1989）相同的图表。我们的图不支持由\ cite {hal89}得出的结论，即所有周期性周期变化的情况都限于具有次要成分且光谱类型晚于F5的二进制文件。在具有早期型次要成分的恒星中也存在周期变化，这表明磁活动是周期变化的一个原因，但不是唯一的原因。发现在封闭的二进制文件中，EW型二进制文件中可能由于第三体的存在而导致周期变化。因此，关于周期变化的最合理的解释是通过第三体的存在而引起的LTTE。通过使用长达百年的最小光时间历史记录，我们分析了Algol二元WW Dra的周期性变化。发现二进制的轨道周期显示了$ \ sim112.2 \ textbf {\ textrm {yr}} $循环变化，振幅为$ \ sim0.1977 \ textbf {\ textrm {days}} $。循环振荡可以通过质量不小于$ 6.43M _ {\ odot} $的第三体归因于LTTE。然而，没有发现第三体的光谱线表明它可能是候选的黑洞。第三天体以小于14.4 AU的距离在轨道上运行，它可能在该系统的演化中起重要作用。

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    Liao, W. -P; Qian, S. -B;

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  • 年度 2010
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