A photometric study of the high-mass-ratio contact binary AV Puppis

Abstract

The multi-color photometric light curves for a contact binary AV Puppis (AV Pup) in $V{R}_c{I}_c$ bandpasses are presented, and they are analyzed by using of the 2013 version of the Wilson-Devinney (W-D) code. The solutions suggest that AV Pup is a peculiar A-subtype W UMa contact binary with a high mass ratio ($q=m_2/m_1=0.896$) and a fill-out factor ($f=10\%$). Combining with our newly determined times of minimum with those collected from literatures, the orbital period changes of this system are investigated. The $O-C$ analysis shows that the orbital period of AV Pup is increasing at a rate of $\mathrm{d}P/\mathrm{d}t=4.83\times 10^{-7}\mathrm{days}\mathrm{y}{\mathrm{r}}^{-1}$, which can be explained by mass transfer from the less massive component to the more massive one.

9 pages, 4 figures