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New BVR photometric observations and light curve analysis of eclipsing binary V700 Cyg

机译:新的BVR光度观测和光曲线分析eClipsing二元v700 cyg

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New CCD observations of eclipsing binary V700 Cyg were carried out in BVR filters during two nights in August 2017. Using the Binary Maker 3.0 and PHOEBE 0.31a softwares, the BVR light curves were analyzed and absolute parameters were determined. Our solutions show that the V700 Cyg is a W-type contact binary with mass ratio of q = 0.54 and the degree of overcontact is f = 17.9%. The asymmetric light curves in the maxima are explained by one cool spot on the secondary component. The positions of both components of V700 Cyg are shown in H-R and M-L diagrams, which indicate that the more massive component may be evolved main sequence star. The orbital period of eclipsing binary V700 Cyg was analyzed based on all times of minima from 1994 to 2017 (including new eclipse times). Analysis of the O-C curve shows that the orbital period of V700 Cyg is decreasing at a rate of dP/dt = -1.39 x 10(-7) d yr(-1). This decreasing period can be interpreted by mass transfer from the more massive component to the less massive one. The cyclic variation in the O-C curve is probably due to the existence of a third body in the system with a period of 12.6 years and it can be probably a red dwarf.
机译:在2017年8月的两夜,在BVR过滤器中进行了新的CCD观察。在2017年8月的两夜,在BVR过滤器中进行。使用二元制造商3.0和Phoebe 0.31A软件,分析了BVR光线曲线,确定了绝对参数。我们的解决方案表明,V700 CYG是一个具有Q = 0.54的质量比的W型接触二进制,外接接触程度为F = 17.9%。最大值中的不对称光曲线由次要组分上的一个冷点解释。 V700 CYG的两种组分的位置在H-R和M-L图中示出,表明较大的组分可以进化主要序列星。基于1994年至2017年(包括新的Eclipse时间)的所有时间进行分析,分析了二元V700 Cyg的轨道周期。对O-C曲线的分析表明,V700 CYG的轨道周期以DP / DT = -1.39×10(-7)D YR(-1)的速率降低。这种降低的时期可以通过从更巨大的组分到较少的大量成分来解释。 O-C曲线中的循环变化可能是由于系统中的第三个体的存在,为12.6岁,可能是红色矮人。

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