Photometric study of the close binary system DD Monocerotis*
Yunnan Observatory, Academia Sinica, Kunming, China
Send offprint request to: Qian Shenbang
Accepted: 30 January 1997
New BV light curves of the short-period eclipsing binary system DD Mon have been obtained. Light-curve variability is seen in both B and V bands as compared with the light curves obtained in 1986 by Yamasaki et al. (1990). The light curves are analyzed by using Wilson-Devinney's synthetic light-curve program, and the present photometric solution reveals that DD Mon is a near-contact binary with the secondary component filling the Roche lobe. Combined with Yamasaki et al.'s (1990) spectroscopic results, absolute quantities of DD Mon are derived: mass of the primary , mass of the secondary , radius of the primary , radius of the secondary . These results show that the components of DD Mon have evolved away from the ZAMS and through a mass-transfer process to the present semi-detached state. The variation in shape of the light curve may be caused by the evolution of the system and the activity of dark spots.
Key words: stars: DD Mon / binaries: eclipsing / stars: fundamental parameters
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© European Southern Observatory (ESO), 1997