Abstract
Complete UV band light curve of the eclipsing binary AI Dra was observed with the Lunar-based Ultraviolet Telescope (LUT) in October 2014. It is very useful to adopt this continuous and uninterrupted light curve to determine physical and orbital parameters of the binary system. Photometric solutions of the spot model are obtained by using the W–D (Wilson and Devinney) method. It is confirmed that AI Dra is a semi-detached binary with secondary component filling its critical Roche lobe, which indicates that a mass transfer from the secondary component to the primary one should happen. Orbital period analysis based on all available eclipse times suggests a secular period increase and two cyclic variations. The secular period increase was interpreted by mass transfer from the secondary component to the primary one at a rate of \(4.12 \times10^{-8}M_{\odot}/\mbox{yr}\), which is in agreement with the photometric solutions. Two cyclic oscillations were due to light travel-time effect (LTTE) via the presence of two cool stellar companions in a near 2:1 mean-motion resonance. Both photometric solutions and orbital period analysis confirm that AI Dra is a mass-transferring binary, the massive primary is filling 69 % of its critical Roche lobe. After the primary evolves to fill the critical Roche lobe, the mass transfer will be reversed and the binary will evolve into a contact configuration.
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Acknowledgements
This work is supported by the Key Research Program of Chinese Academy of Sience (KGED-EW-603), the National Natural Science Foundation of China (Nos. 11403095, 11133007, and 11325315), the Yunnan Natural Science Foundation (2014FB187), the Science Foundation of Yunnan Province (Grant No. 2012HC011), and the Strategic Priority Research Program “The Emergence of Cosmological Structures” of the Chinese Academy of Sciences, Grant No. XDB09010202. The authors thank the LUT group including Drs. Wei J.-Y., Meng X.-M., Han X.-H., and Wang J. for helping observations and data reduction.
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Liao, W., Qian, S., Li, L. et al. LUT observations of the mass-transferring binary AI Dra. Astrophys Space Sci 361, 184 (2016). https://doi.org/10.1007/s10509-016-2771-7
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DOI: https://doi.org/10.1007/s10509-016-2771-7