Model of Close Binary System

Abstract

This research studies the physical property for model binary and considers the period change to analyze the evolution for CE Leonis, Is is a contact binary system with orbital period of about 0.303 days. The observation had observed in January-February 2009 at Princess Sirindhorn Observatory, Chiang Mai University. The observation used 0.5 metres Ritchey-Chretien reflecting teflecting telescope and CCD Photometer SBLG ST10-XME 1024 × 1024 pixels with blue, visual and red filters of UBV system. Willson-Devinney program was used to analyze the light curve for computing a set of system’s parameters. The solution shows that CE Leonis is a contact binary system with inclination (i) mean 87.4 ± 0.4 degree and mass ratio (q) mean 1.99427 ± 0.00743. The mass ratio has been change from previous published paper with q<1. This would imply that the binary system CE Leonis has W-type. The solution shows that CE Leonis is a contact binary system.