Studying stellar magnetic activity is a valuable path for understanding the structure and evolution of stellar magnetic field. It can provide constraints to optimize the stellar dynamo model. Wide field surveys provide long-term observations for a lot of stars, which can find more magnetically active stars.We present a new discovered magnetically active binary system detected by Yunnan-HongKong wide field survey, with an orbital period of 0.60286 days. Two color photometry for the system was performed using the 1.0 m Cassegrain telescope of Yunnan Observatories with its CCD camera. In the observed light curves, there are clearly different light maxima existed in the out-of-eclipse regions. We made spectroscopic observations for the binary system using 2.4 m telescope and Yunnan Faint Object Spectrograph and Camera(YFOSC) at 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 curve mentioned above by means of the Wilson-Devinney(WD) code, orbital parameters and starspot configuration of the binary system are obtained. Our results show that the binary is a detached system with a mass ratio of 0.24. The primary is a K3V type star with magnetic activity on its surface. Our photometric observation of the binary system during three years shows that its starspots evolve along with time.
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