Pulsations of the AS Cam Eclipsing Binary in TESS Light Curves

Kozyreva V.S. Kusakin A.V. Bogomazov A.I. Omarov C.T.
October 2021 Pleiades Publishing

Astrophysical Bulletin
2021 #76 Issue 4 424 - 434 pp.

Abstract: An analysis of TESS satellite observations of the AS Cam eclipsing binary has shown that the light of this source pulsates at two frequencies: (Formula presented.) days^–1 and (Formula presented.) days^–1 with the amplitudes (Formula presented.) and (Formula presented.) correspondingly. Such variations are typical for slowly pulsating B-type stars. We modeled the light curves of AS Cam obtained from 1968 to 2019 to confirm the discovery of a gradual increase in the orbit eccentricity of the system by approximately 0.018 over 50 years. A third light, as one of the light curve solution parameters, on average, amounts to approximately 4% of the total luminosity of the system. For AS Cam this would correspond to an F8–F9-type suggested third body—a main sequence star, the presence of which follows from the light equation of the system. If the third light is a result of a random overlapping of a star unrelated to AS Cam, then the third body may turn out to be a degenerate object or a close binary system. The extremely slow apsidal motion in this system (compared to the value predicted by the standard theory) can be explained by the gravitational influence of a third body with a mass of about (Formula presented.) and an orbital inclination of about 70 with respect to the image plane.

stars: binaries: eclipsing , stars: individual: AS Cam

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Sternberg Astronomical Institute, Moscow State University, Moscow, 119234, Russian Federation
Fesenkov Astrophysical Institute of the National Center for Space Research and Technologies, Almaty, 050020, Kazakhstan

Sternberg Astronomical Institute
Fesenkov Astrophysical Institute of the National Center for Space Research and Technologies

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