GJ 3236: An active red-dwarf eclipsing binary system |
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| Institution: | 1. School of Physics and Electronic Science, Guizhou Normal University, Guiyang, 550001 China;2. Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing, Guizhou Normal University, Guiyang 550001, China;3. Yunnan Observatories, Chinese Academy of Sciences (CAS), Kunming, P. O. Box 110, 650216 China;4. Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, P. O. Box 110, 650216 China;5. University of Chinese Academy of Sciences, Yuquan Road 19#, Sijingshang Block, Beijing, 100049 China;6. Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing, 100012, China;7. School of Physics and Electronic Engineering, Sichuan University of Science and Engineering, Zigong 643000, China |
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| Abstract: | GJ 3236 is a low-mass red-dwarf eclipsing binary (EB) with two M4V components. In this paper, new photometric light curves (LCs) of GJ 3236 are presented and analyzed by using the 2013 version of the Wilson–Devinney (W–D) code. Our photometric solutions suggest that GJ 3236 is an active detached EB system with strong magnetic field. Since 2009, we have monitored this target more than 10 years and obtained 22 mid-eclipse times with high precision. By using the O–C method, we revised its period as 0.7712562 days. According to Applegate mechanism, the O–C diagram of GJ 3236 should show a quasi-periodic variation, however, it does not now. Based on these, we thought that it is possible evolved through the accretion of circumstellar matter. Besides, both of components of GJ 3236 present a similar radius inflation, which could be explained by the strong magnetic activity. |
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| Keywords: | Red dwarf Eclipsing binary Flares Magnetic activity cycle |
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