活动过接触双星v396的周期变化和四色光变曲线
Period changes and four-color light curves of the active overcontact binary v396 monocerotis
摘要：
本文利用2003年版WD程序对V396 Mon的首个安全四色光变曲线进行了分析。确定了V396 Mon是一个W型浅接触二元系统，其质量比为$q=2.554(\pm0.004)$，接触度因子为$f=18.9%(\pm1.2%)$。基于所有可用数据的周期研究表明，系统的周期包括长期减少（$dP/dt=-8.57\times{10^{-8}}$天/年）和振荡（$A_3=0.^{d}0160$ ; $T_3=42.4\,years$）。它们分别由角动量损失（AML）和光时效应引起。第三颗可疑的天体可能是一颗小型的M型恒星（大约0.31太阳质量）。虽然有证据表明该系统具有很强的磁活动性，但通过分析发现Applegate机制不能解释这种周期性变化。这是一个特别重要的系统，根据钱的统计接触双星，因为它的质量比位于附近的建议枢轴点的物理结构的接触双星应该振荡。
英文摘要：
This paper analyzes the first secured four color light curves of V396 Mon using the 2003 version of the WD code. It is confirmed that V396 Mon is a shallow W-type contact binary system with a mass ratio $q=2.554(\pm0.004)$ and a degree of contact factor $f=18.9%(\pm1.2%)$. A period investigation based on all available data shows that the period of the system includes a long-term decrease ($dP/dt=-8.57\times{10^{-8}}$ days/year) and an oscillation ($A_3=0.^{d}0160$; $T_3=42.4\,years$). They are caused by angular momentum loss (AML) and light-time effect, respectively. The suspect third body perhaps is a small M-type star (about 0.31 solar mass). Though some proofs show that this system has strong magnetic activity, through analyzing we found that the Applegate mechanism cannot explain the periodic changes. This binary is an especially important system according to Qian's statistics of contact binaries as its mass ratio lies near the proposed pivot point about which the physical structure of contact binaries supposedly oscillate.
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