| Issue |
Astron. Astrophys. Suppl. Ser.
Volume 125, Number 3, November I 1997
|
|
|---|---|---|
| Page(s) | 475 - 478 | |
| DOI | https://doi.org/10.1051/aas:1997235 | |
| Published online | 15 November 1997 | |
Photometric study of the close binary system DD Monocerotis*
Yunnan Observatory, Academia Sinica, Kunming, China
Send offprint request to: Qian Shenbang
Received:
20
November
1996
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
© European Southern Observatory (ESO), 1997