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Paper: Photometric Analysis of the Contact Binary System V829 Hercules
Volume: 370, Solar and Stellar Physics Through Eclipses
Page: 237
Authors: Ozkardes, B.; Erdem, A.
Abstract: New BV R light curves and photometric analysis of the contact binary star V829 Her are presented. The light curves were obtained at the Çanakkale Onsekiz Mart University Observatory in 2005. All the times of minimum light were collected and combined with the new ones presented in this work. The variation of the orbital period of the system was then analysed. Sinusoidal and secular changes were found. These variations were examined in terms of two plausible mechanisms, namely (i) mass transfer, and (ii) a light-time effect due to an unseen component in the system. The instrumental differential magnitudes of the system were converted into standard magnitudes. So, we calculate BV R standard magnitudes of the system and obtain the mean color indices of B − V = 0.59 ± 0.01 for V829 Her, which indicates the spectral type of the system to be G0-1. The light curves are generally those of contact binaries, but there are large asymmetries between maxima. New BV R light curves and radial velocity curves available from the literature were analysed, simultaneously. Light curve asymmetries of the system were explained in terms of a large dark starspot on the more massive component. Absolute parameters of the system were also derived.
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