Spectroscopic and photometric study of the contact binary BO CVn |
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| Authors: | S Zola RH Nelson HV Şenavcı T Szymanski A Kuźmicz M Winiarski D Jableka |
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| Institution: | 1. Astronomical Observatory, Jagiellonian University, ul. Orla 171, 30-244 Krakow, Poland;2. Mt. Suhora Observatory, Pedagogical University, ul. Podchorazych 2, 30-084 Krakow, Poland;3. 1393 Garvin Street, Prince George, BC, Canada V2M 3Z1;4. Guest investigator, Dominion Astrophysical Observatory, Herzberg Institute of Astrophysics, National Research Council of Canada;5. Ankara University, Faculty of Science, Dept. of Astronomy and Space Sciences, TR-06100 Tando?an-Ankara, Turkey |
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| Abstract: | We present the results of the study of the contact binary system BO CVn. We have obtained physical parameters of the components based on combined analysis of new, multi-color light curves and spectroscopic mass ratio. This is the first time the latter has been determined for this object. We derived the contact configuration for the system with a very high filling factor of about 88%. We were able to reproduce the observed light curve, namely the flat bottom of the secondary minimum, only if a third light has been added into the list of free parameters. The resulting third light contribution is significant, about 20–24%, while the absolute parameters of components are: M1 = 1.16, M2 = 0.39, R1 = 1.62 and R2 = 1.00 (in solar units).The O-C diagram shows an upward parabola which, under the conservative mass transfer assumption, would correspond to a mass transfer rate of dM/dt = 6.3 × 10?8M⊙/yr, matter being transferred from the less massive component to the more massive one. No cyclic, short-period variations have been found in the O-C diagram (but longer-term variations remain a possibility). |
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