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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >The first photometric investigation and period study of two W?UMa-type binary systems: EF?CVn and EH?CVn
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The first photometric investigation and period study of two W?UMa-type binary systems: EF?CVn and EH?CVn

机译：两种W？UMa型二元系统EF？CVn和EH？CVn的首次光度研究和周期研究

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By analyzing the V, Rc, and Ic light curves of the two neglected W?UMa-type binaries EF?CVn and EH?CVn using the Wilson–Devinney code, we have discovered that EF?CVn is a median contact binary while EH?CVn is a shallow contact binary, and they are both W-subtype binary systems. The mass ratio and fillout factor of EF?CVn are q = 3.493 ± 0.063 and f = 32.0% ± 12.9%, respectively. Those of EH?CVn are q = 3.331 ± 0.052 and f = 19.2% ± 10.9%, respectively. The addition of a dark spot on the secondary star is used to interpret the asymmetric light curves of EF?CVn. An orbital period analysis of EF?CVn indicates that there is a cyclic oscillation with an amplitude of 0.0064?d and a period of 15.65?yr, accompanied by a continuous increase at a rate of dp/dt = 4.52 × 10?7?d?yr?1. The periodic oscillation can reasonably be explained by the light travel-time effect of an additional component. The secular increase is probably generated by conservative mass transfer from the primary star to the secondary star. Meanwhile, an analysis of the orbital period of EH?CVn was also performed. A long-term period decrease at a rate of dp/dt = ?5.20 × 10?8?d?yr?1 was discovered; this is possibly interpreted as caused by mass transfer from the more massive component to the less massive component.
机译：通过使用Wilson-Devinney码分析两个被忽略的W？UMa型二进制EF？CVn和EH？CVn的V，Rc和Ic光曲线，我们发现EF？CVn是中值接触二进制，而EH？CVn是中值接触二进制。 CVn是浅接触二进制，并且它们都是W型子二进制系统。 EF≥CVn的质量比和填充系数分别为q ＝ 3.493±0.063和f ＝ 32.0％±12.9％。 EH2CVn的q分别为q = 3.331±0.052和f = 19.2％±10.9％。在次级恒星上加一个暗点用于解释EF？CVn的不对称光曲线。 EF？CVn的轨道周期分析表明，存在一个振幅为0.0064？d，周期为15.65？yr的周期性振荡，并以dp / dt = 4.52×10？7？d的速率连续增加。 ？yr？1。周期性振荡可以通过附加组件的光传播时间效应合理地解释。世俗的增加可能是由从原恒星到副恒星的保守质量转移产生的。同时，还对EHΔCVn的轨道周期进行了分析。发现以dp / dt ＝ 5.20×10 8 8 dyr 1的长期减少。这可能被解释为是由于质量从较大的组分传递到较小的组分引起的。

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