云南-香港宽视场巡天新发现的一个磁活动双星系统

A New Magnetically Active Binary System Discovered in Yunnan-Hong Kong Wide Field Survey

云南-香港宽视场巡天新发现了一个磁活动双星系统,其轨道周期为0.60286 d.利用云南天文台1 m光学望远镜附加CCD (Charge-Coupled Device)相机,观测得到了这个双星系统的V、Rc双色光变曲线,结果表明该系统食外存在明显的测光畸变.借助云南天文台丽江2.4 m望远镜附加云南暗弱天体光谱成像仪(Yunnan Faint Object Spectrograph and Camera, YFOSC)对该双星系统的分光观测,测定了该双星系统主星的视向速度曲线并发现该系统的主星表面存在着强烈的色球活动,从而证明系统的光变曲线畸变源自主星的黑子活动.使用W-D (Wilson-Devinney)程序分析上述观测得到的光变曲线和视向速度曲线,得到了该双星系统的轨道参数以及黑子参数.最后,对该系统的特性进行了讨论并对未来的工作进行了展望.

We present a newly discovered magnetically active binary system detected by Yunnan-Hong Kong wide field survey,with an orbital period of 0.60286 day.Two color photometry for the system was performed using the 1 m Cassegrain telescope of Yunnan Observatories with its CCD(Charge-Coupled Device)camera.In the observed light curves,there are clear different light maxima existed in the out-of-eclipse regions.We made spectroscopic observations for the binary system using the 2.4 m telescope and YFOSC(Yunnan Faint Object Spectrograph and Camera)of Lijiang station of Yunnan Observatories,China.The radial velocity curve was derived for primary star of the binary system.The primary star exhibited strong chromospheric activity,which confirms that the distortion of the light curves results from the starspot activity on the primary star.Through analyzing the light curves and RV(Radial Velocity)curve mentioned above by means of the Wilson-Devinney(W-D)code,orbital parameters and starspot configuration of the binary system are obtained.Finally,we have discussed the properties of the binary system and given the prospects on the future work.