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Close binary system GO Cyg |
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| Authors: | B Ula? B Kalomeni V KeskinO Köse K Yakut |
| Institution: | a Department of Astronomy and Space Sciences, University of Ege, 35100 Bornova-?zmir, Turkey b Department of Physics, ?zmir Institute of Technology, Turkey c Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK |
| Abstract: | In this study, we present long term photometric variations of the close binary system GO Cyg. Modelling of the system shows that the primary is filling Roche lobe and the secondary of the system is almost filling its Roche lobe. The physical parameters of the system are M1 = 3.0 ± 0.2M⊙, M2 = 1.3 ± 0.1M⊙, R1 = 2.50 ± 0.12R⊙, R2 = 1.75 ± 0.09R⊙, L1 = 64 ± 9L⊙, L2 = 4.9 ± 0.7L⊙, and a = 5.5 ± 0.3R⊙. Our results show that GO Cyg is the most massive system near contact binary (NCB). Analysis of times of the minima shows a sinusoidal variation with a period of 92.3 ± 0.5 yr due to a third body whose mass is less than 2.3M⊙. Finally a period variation rate of −1.4 × 10−9 d/yr has been determined using all available light curves. |
| Keywords: | Stars: binaries: eclipsing Stars: binaries: close Stars: binaries: general Stars: fundamental parameters Stars: low-mass |
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