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The contact binary V344 Lacertae: is it a triple system?

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Abstract

The \(VRI\) passbands light curves of V344 Lac were presented and analyzed by using the latest version of the W-D code. The observed spectrum reveals that V344 Lac is not an A3 type but would be a later F type star according to the yielded temperature. The results of solution show that V344 Lac is an A-subtype contact binary, with a moderate photometric mass ratio of \(0.387\pm 0.003\) and a moderate contact factor of \(44.6\pm 3.0\%\). Based on the parallax given by Gaia, the parameters of the components are estimated as: \(M_{1}=1.16~\mathrm{M}_{\odot }\), \(M_{2}=0.45~\mathrm{M}_{\odot }\), \(R_{1}=1.31~\mathrm{R}_{\odot }\), \(R_{2}=0.88~\mathrm{R}_{\odot }\), \(L_{1}=2.512~\mathrm{L}_{\odot }\), \(L_{2}=1.057~\mathrm{L}_{\odot }\). The period investigation indicates that V344 Lac may have an eccentric orbital oscillation, with \(P_{3}=12.4\pm 0.5~\text{yr}\), \(A_{3}=0.0020\pm 0.0002~\text{d}\), and \(e=0.38\pm 0.16\). Analysis shows such oscillation would be caused by a magnetic activity which can be explained by the Applegate mechanism. Meanwhile, according to the value of \(l_{3}\) and the estimated physical parameters of V344 Lac, the mass of the third companion may be \(0.79~\mathrm{M}_{\odot }\). This third body could be a wide company.

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Acknowledgements

We are grateful to the anonymous referee who has given very useful suggestions to improve the paper. This work is partly supported by the Chinese Natural Science Foundation (No. 11773066), the young academic and technology leaders project of Yunnan Province (No. 2015HB098), and the Open Project Program of the Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences. New observations of the systems were obtained with the 2.4-m telescope of Lijiang station of Yunnan Observatories, the 1-m telescope at the Weihai Observatory (WHO) of Shandong University, with the 85-cm telescope at Xinglong observation base, and with the 1-m and 60-cm telescope at Yunnan Observatories (YNOs). We would like to thank all the staff of the 2.4-m telescope of Lijiang station of Yunnan Observatories for their help and support during our observations. We also thank the persons who observed or reduced the data.

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  1. Yunnan Observatories, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming, 650216, P.R. China

    Liang Liu, Shengbang Qian, Jiajia He, Linjia Li, Ergang Zhao & Xuzhi Li

  2. Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming, 650216, P.R. China

    Liang Liu, Shengbang Qian, Jiajia He, Linjia Li, Ergang Zhao & Xuzhi Li

  3. Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing, 100012, P.R. China

    Liang Liu, Shengbang Qian, Jiajia He, Linjia Li, Ergang Zhao & Xuzhi Li

  4. University of Chinese Academy of Sciences, Yuquan Road 19#, Sijingshang Block, Beijing, 100049, P.R. China

    Liang Liu, Shengbang Qian & Xuzhi Li

  5. Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai, 264209, P.R. China

    Kai Li

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Liu, L., Qian, S., Li, K. et al. The contact binary V344 Lacertae: is it a triple system?. Astrophys Space Sci 365, 71 (2020). https://doi.org/10.1007/s10509-020-03784-8

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