Charge-coupled device observations of V388 Cyg |
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Authors: | Young Woon Kang Ho-il Kim Woo-Baik Lee Kyu-Dong Oh |
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Institution: | ;1Department of Earth Sciences, Sejong University, Seoul 143-747, Korea;2Korea Astronomy Observatory, Whaam-dong, Yusong-gu, Taejon 305-348, Korea;3Department of Earth Sciences, Chonnam National University, Kwangju 500-757, Korea |
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Abstract: | We present BVR full-light curves of V388 Cyg to provide a complete photometric solution for the first time. The light curves show a high degree of asymmetry (O'Connell effect). The maxima at 0.25 phase (Max I) are 0.023, 0.018 and 0.012 mag higher than those at 0.75 phase (Max II) in B , V and R , respectively. Three possible spot models are applied to fit the asymmetric light curves of V388 Cyg, in order to explain the O'Connell effect. We conclude that the model of the cool spot on the cooler star is the most reasonable model for V388 Cyg. The continuous period variation is confirmed by recently collected times of minima, including one minimum that is determined in this paper. The period decrease rate is estimated as d p /d t =−2.055×10−7 d yr−1 . |
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Keywords: | binaries: eclipsing stars: individual: V388 Cyg stars: magnetic fields |
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