ROSAT亮源1 RXS J201607 .0+251645：一颗活跃的大陵型双星
The ROSAT Bright Source 1RXS J201607.0+251645: An Active Algol-type Binary
摘要：
1 RXS J201607.0251645首次被确认为食双星。本文介绍了0.6米望远镜在V波段三年的初步观测和0.8米望远镜在V和R波段六夜的扩大观测。系统的光变曲线为EB型。测得了5个光极小时刻，并确定了轨道周期为0.388058d（0.00044d）。2003年版的威尔逊-德文尼程序给出的光度解表明该双星是一个半分离系统，光度质量比为0.895（0.006），可能包含一个G5主星和一个超大型K5副星。质量较小的组分已完全填满其洛希瓣，而另一个组分几乎填满其洛希瓣，填充因子为93.4%。从2005年到2007年，该系统在其相位折叠图中显示出变化的O 'Connell效应，并且具有log（LXLbol）3.27的X射线发光。可能的机制来解释这两种现象进行了讨论。最后，我们推测该双星可能处于热弛豫振荡（TRO）理论预测的热振荡状态，也可能演化为接触双星。
英文摘要：
1RXS J201607.0251645 is identified to be an eclipsing binary for the first time. We present the preliminary observations in V band with the 0.6-m telescope for three years and the extensive observations in V and R band with the 0.8-m telescope for six nights respectively. The light curve of the system is EB type. Five light minimum times were obtained and the orbital period of 0.388058d(0.00044d) is determined. The photometric solution given by the 2003-version Wilson-Devinney program suggests the binary is a semi-detached system with the photometric mass ratio 0.895(0.006), which probably comprise a G5 primary and an oversize K5 secondary. The less massive component has completely filled up its Roche lobe, while the other almost fills its Roche lobe with the filling factor of 93.4%. The system shows a varying O'Connell effect in its phase folded diagrams from 2005 to 2007, and is X-ray luminous with log(LXLbol)3.27. Possible mechanisms to account for these two phenomena are discussed. Finally, we infer the binary may be in thermal oscillation predicted by thermal relaxation oscillation (TRO) theory or may evolve into a contact binary.
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