arXiv 1109.26342011-09-12astro-ph.SR

密近双星系统GO Cyg

Close Binary System GO Cyg

B. Ulas, B. Kalomeni, V. Keskin, O. Kose, K. Yakut

备注：: Accepted for publication in New Astronomy, 18 pages, 4 figures, 7 tables
DOI：: 10.1016/j.newast.2011.09.002

摘要：

在这项研究中，我们提出的长期光度变化的密切的双星系统\astrobj{GO Cyg}。模拟结果表明，该系统的初级波充满了洛希瓣，次级波几乎充满了洛希瓣。系统的物理参数为$M_1 = 3.0\pm0.2 M_{\odot}$、$M_2 = 1.3 \pm 0.1 M_{\odot}$、$R_1 = 2.50\pm 0.12 R_{\odot}$、$R_2 = 1.75 \pm 0.09 R_{\odot}$、$L_1 = 64\pm 9 L_{\odot}$、$L_2 = 4.9 \pm 0.7 L_{\odot}$和$a = 5.5 \pm 0.3 R_{\odot}$。结果表明，\astrobj{GO Cyg}是质量最大的近接触双星系统.分析的最小值的时间显示出一个正弦变化的周期$92.3\pm0.5$年由于第三个机构的质量小于2.3 $M_{\odot}$。最后，利用所有可用的光变曲线确定了周期变化率为$-1.4\times10^{-9}$ d/yr。

英文摘要：

In this study, we present long term photometric variations of the close binary system \astrobj{GO Cyg}. Modelling of the system shows that the primary is filling Roche lobe and the secondary of the system is almost filling its Roche lobe. The physical parameters of the system are $M_1 = 3.0\pm0.2 M_{\odot}$, $M_2 = 1.3 \pm 0.1 M_{\odot}$, $R_1 = 2.50\pm 0.12 R_{\odot}$, $R_2 = 1.75 \pm 0.09 R_{\odot}$, $L_1 = 64\pm 9 L_{\odot}$, $L_2 = 4.9 \pm 0.7 L_{\odot}$, and $a = 5.5 \pm 0.3 R_{\odot}$. Our results show that \astrobj{GO Cyg} is the most massive system near contact binary (NCB). Analysis of times of the minima shows a sinusoidal variation with a period of $92.3\pm0.5$ years due to a third body whose mass is less than 2.3$M_{\odot}$. Finally a period variation rate of $-1.4\times10^{-9}$ d/yr has been determined using all available light curves.

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