Revised Orbital Parameters of Beaming Eclipsing Binary System HV Cnc from Kepler Photometry

Abstract

High precision photometry gathered from Kepler database and radial velocity measurements of the HV Cnc system found in the literature were simultaneously analyzed by the Wilson-Devinney (WD) code to better understand system parameters. Some physical quantities needed by the WD code in iterations, such as limb darkening coefficients, Kurucz’s model atmospheres, and blackbody approach were considered by using precise transmission curves of each Kepler channel. Therefore, we obtained a set of revised system parameters relative to the previous solution of Gökay et al. (2013) in which the results were based on the photometry of 2MASS archival data. In the present solution, we recognized a low amplitude (ΔmKepler ∼ 0.m001) brightening at the primary quadrature of the light curve. This excess light is modelled by considering a combination of ellipsoidality, reflection, and Doppler beaming effects. Consequently, we propose the system as a new candidate of Doppler beaming binary.According to the absolute parameters of the primary component, we discussed the evolutionary status of the blue straggler component in the system. Furthermore, on the basis of absolute parameters, distance estimation to the system is 827 ± 20 pc which supports that HV Cnc is very likely a member of M67 cluster.