A photometric study of the short-period eclipsing binary 1SWASP J204932.94-654025.8, showing strong third light |
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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), P. O. Box 110, Kunming 650216, China;4. Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, P. O. Box 110, Kunming 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. Department of Theoretical Physics and Astrophysics, Masaryk University, Kotlá?ská 2, Brno 611 37, Czech Republic;8. China University of Petroleum-Beijing at Karamay, Anding Road 355, Karamay 834000, China;9. School of Physics and Electronic Engineering, Sichuan University of Science and Engineering, Zigong 643000, China |
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| Abstract: | 1SWASP J204932.94-654025.8 (hereafter J2049) is a newly discovered eclipsing binary system with an orbital period of 0.2299103 days. BVRc light curves (LCs) are presented and analyzed by using the 2013 version of the Wilson–Devinney (W–D) program. Because the observed LCs are asymmetric, a hot star-spot was employed on the secondary component during our analysis. We found that J2049 is a W-subtype shallow contact eclipsing binary system with an orbit inclination of 62°.69 ± 0°.95 and a mass ratio of q =1.326 ± 0.056. More importantly, we found the presence of a strong third light, with an average luminosity contribution of 31.3% of the total light. Based on times of the light minima, the orbital period changes of J2049 are studied for the first time, and there is no evidence for any significant dp/dt now. Considering the presence of the third light and the short time span of the eclipse times, more observations are needed in the future. |
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