A New Magnetically Active Binary System Discovered in Yunnan-Hong Kong Wide Field Survey |
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Authors: | WANG Jian-hua GU Sheng-hong WANG Xiao-bin Bill YEUNG Eric NG |
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Institution: | 1. Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216;2. Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216;3. School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 101408;4. Hong Kong Astronomical Society, Hong Kong 999077 |
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Abstract: | We present a newly discovered magnetically active binary system detected by Yunnan-Hong Kong wide field survey, with an orbital period of 0.60286 days. 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 clearly 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 W-D (Wilson-Devinney) 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. |
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Keywords: | Binary: eclipsing Stars: activity stars: magnetic field starspots |
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