New Period Investigation of Algol-like Near-Contact Binary EG Cephei

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Authors

ZEJDA Miloslav ZHU Liying QIAN Shengbang LIAO WenPing MIKULÁŠEK Zdeněk

Year of publication 2009
Type Article in Periodical
Magazine / Source PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
MU Faculty or unit

Faculty of Science

Citation
Field Astronomy and astrophysics
Keywords stars: binaries: eclipsing; stars: evolution; stars: individual (EG Cephei)
Description The Algol-like Near Contact Binary EG Cephei was observed in 2008 October. All of the available eclipse times, including 735 epochs, spanning more than 100 years were analyzed. A period oscillation with a period of 35.8 (+-0.1) yr and an amplitude of about 0.0037(+-0.0002)d was found, while undergoing a secular increase at a rate of dP/dt = 3.4 x 10e-8(+-0.1) d/yr. This continuous period increase may be caused by mass transfer from the secondary component to the primary one on a thermal timescale, which is consistent with the Algol-like semi-detached configuration of EG Cep. Combining with the spectroscopic and photometric results, we derived a conservative mass-transfer rate of this target, dM/dt=3.0(+-0.1)x10e-8 Mo/yr. The oscillation part of the period variation may be the result of a light-time effect due to the existence of a coplanar additional body with a mass of M3 = 0.11Mo, and a corresponding radius of a3 = 14AU.
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