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arXiv 1502.00904astro-ph.SR
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六个食双星在W UMa星周期下限的光变曲线解

Light curve solutions of six eclipsing binaries at the lower limit of periods of the W UMa stars

Diana P. Kjurkchieva, Dinko P. Dimitrov, Sunay I. Ibryamov

摘要:

本文给出了六个食双星在W UMa星轨道周期下限的V和I波段光度观测结果。其中三个是新发现的食系统。光变曲线解表明,所有的短周期目标都是接触或过接触双星,并在短周期系统家族中增加了6个新的双星。四个双星的大小相等,质量比接近1。所有目标的V-I颜色的相位变化可以通过其背表面的温度低于其侧表面的温度来解释。有5个系统表现出O 'Connell效应,这种效应是由其主要部件侧面的冷斑再现的。V1067 Her在2011年和2012年的光变曲线由直径相反的斑点拟合。将WUMa星细分到我们的目标的标准导致了模糊的结果。

英文摘要:

Photometric observations in V and I bands of six eclipsing binaries at the lower limit of the orbital periods of W UMa stars are presented. Three of them are newly discovered eclipsing systems. The light curve solutions revealed that all short-period targets were contact or overcontact binaries and added new six binaries to the family of short-period systems with estimated parameters. Four binaries have equal in size components and mass ratio near 1. The phase variability of the V-I colors of all targets may be explained by lower temperatures of their back surfaces than those of their side surfaces. Five systems revealed O'Connell effect that was reproduced by cool spots on the side surfaces of their primary components. The light curves of V1067 Her in 2011 and 2012 were fitted by diametrically opposite spots. The applying of the criteria for subdivision of the W UMa stars to our targets led to ambiguous results.

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