Photometric solution and period analysis of the contact binary system AH Cnc
Photometric solution and period analysis of the contact binary system AH Cnc
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接触二元系AH Cnc的光度解及周期分析
DOI：
10.1088/1674-4527/16/10/157
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发表时间：
2016
影响因子：
1.8
通讯作者：
Zhou Qiang
中科院分区：
文献类型：
--
作者：
Peng Ying-Jiang;Luo Zhi-Quan;Zhang Xiao-Bin;Deng Li-Cai;Wang Kun;Tian Jian-Feng;Yan Zheng-Zhou;Pan Yang;Fang Wei-Jing;Feng Zhong-Wen;Tang De-Lin;Liu Qi-Li;Sun Jin-Jiang;Zhou Qiang
利用50 BiN望远镜对疏散星团M67中的一个W UMa型系统AH Cnc进行了测光观测。采集了约100小时的时间序列B和V波段数据，在此基础上确定了8个新的光极小期。应用Wilson-Devinney方法，对光变曲线进行了模拟，并导出了修正的二元体系光度解。我们证实了AH Cnc是一个深接触（f = 51%）、低质量比（q = 0.156）系统。采用从主星系团研究中导出的距离模，重新计算了双星系统的物理参数，即质量和半径。主成分和次成分的质量和半径分别为1.188（±0.061）M <$，1.332（±0.063）R <$，0.185（±0.032）M <$，0.592（±0.051）R <$。通过将新导出的最小定时加入到所有可用的数据中，研究了AH Cnc的周期变化。这表明该双星的轨道周期以dp/dt = 4.29 × 10−10 d yr−1的速率持续增加。除了长期的周期增加，一个周期为35.26年的周期变化被确定，这可能是由于一个未解决的第三系统的组成部分。
Photometric observations of AH Cnc, a W UMa-type system in the open cluster M67, were carried out by using the 50BiN telescope. About 100 h of time-series B- and V -band data were taken, based on which eight new times of light minima were determined. By applying the Wilson-Devinney method, the light curves were modeled and a revised photometric solution of the binary system was derived. We confirmed that AH Cnc is a deep contact (f = 51%), low mass-ratio (q = 0.156) system. Adopting the distance modulus derived from study of the host cluster, we have re-calculated the physical parameters of the binary system, namely the masses and radii. The masses and radii of the two components were estimated to be respectively 1.188(±0.061) M⊙, 1.332(±0.063) R⊙ for the primary component and 0.185(±0.032) M⊙, 0.592(±0.051) R⊙ for the secondary. By adding the newly derived minimum timings to all the available data, the period variations of AH Cnc were studied. This shows that the orbital period of the binary is continuously increasing at a rate of dp/dt = 4.29 × 10−10 d yr−1. In addition to the long-term period increase, a cyclic variation with a period of 35.26 yr was determined, which could be attributed to an unresolved tertiary component of the system.