Photometric Elements, Apsidal Motion, Brightness Variations, and Light-time Effect in the Eclipsing Binary System V957 Cephei
Kozyreva V.S. Kusakin A.V. Bogomazov A.I. Omarov C.T. Krylov A.V.
2022Sternberg Astronomical Institute of Moscow University
Peremennye Zvezdy
2022#42Issue 417 - 27 pp.
We obtained several light curves of V957 Cep in 2009, 2011, 2013, 2016, and 2019 at the Crimean Astronomical Station of M.V. Lomonosov Moscow State University and at the Tien Shan Observatory of the V.G. Fesenkov Astrophysical Institute. Using the TESS satellite observations, we found brightness variations of V957 Cep with the period Pp = 0ḍ 664 and amplitude Ap = 0.0076m. For our light curves (2009–2019) and TESS light curves (2019–2020), orbital elements were computed and a new value of the apsidal motion rate dω/dt = 1.47◦ ± 0.15◦ yr−1 was derived. We found a possible light-time effect that can indicate gravitational influence of one or several additional bodies in the system on the central binary. Based on the currently available data, the amplitude and period of the light-time effect still cannot be reliably estimated.
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P.K. Sternberg Astronomical Institute, M.V. Lomonosov Moscow State University, Universitetskij prospect, 13, Moscow, 119234, Russian Federation
V.G. Fesenkov Astrophysical Institute, National Space Agency, Observatory, 23, Almaty, 050020, Kazakhstan
P.K. Sternberg Astronomical Institute
V.G. Fesenkov Astrophysical Institute
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