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A multicolour photometric study for the W ursae majoris type binary LR Camelopardalis

机译：大熊草型二元LR Camelopardalis的多色光度研究

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摘要

A CCD multicolour photometry for the eclipsing binary LR Camelopardalis, obtained on 2008 December 19 and 2010 January 29 and 30 at the Xinglong Station of NAOC, is presented. Using the Wilson-Devinney binary code, a photometric solution was simultaneously derived from B VR light curves. The results show that LR Cam belongs to a W-type contact binary, with a mass ratio of q = 0.300(1) and an overcontact degree of / = 23.5(5)%, indicating that LR Cam is a weak-contact binary. The asymmetric light curves (i.e., the O'Connell effect) were modeled by a dark spot on the more massive component. From the (O -C) curve of LR Cam, it is found that the orbital period shows a sine-like variation superimposed on a secular period increase. The quasi-sinusoidal variation, with A = 0.~d0039(1), P_3 = 5.34(2) yr, and e' = 0.56(3), may more likely result from a light-time effect via the presence of a third body. The long-term period increases at a rate of dP/dt = +0.65(9) x 10 ~(-7)dyr~(-1), which may be interpreted by mass transfer from the less-massive component to the more-massive one. With mass transferring, LR Cam may evolve into a broken-contact binary.
机译：提出了在2008年12月19日和2010年1月29日至30日在NAOC兴隆站获得的用于掩盖二元LR Camelopardalis的CCD多色光度法。使用Wilson-Devinney二进制代码，同时从B VR光曲线得出了一个光度学解决方案。结果表明，LR Cam属于W型接触二元，质量比为q = 0.300（1），超接触度为= 23.5（5）％，表明LR Cam是弱接触二元。非对称光曲线（即O'Connell效应）是通过较大质量分量上的暗点建模的。从LR Cam的（O -C）曲线可知，轨道周期显示为正弦状变化，叠加在长期周期增加上。准正弦变化，A = 0.〜d0039（1），P_3 = 5.34（2）yr，e'= 0.56（3），很可能是由于存在第三个光时效应而引起的身体。长期周期以dP / dt = +0.65（9）x 10〜（-7）dyr〜（-1）的速率增加，这可以解释为从质量较差的组分到质量较差的组分的质量传递。庞大的通过传质，LR Cam可能会演变成断接的二进制。

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