Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26as..125..475q&link_type=abstract
A & A Supplement series, Vol. 125, November I 1997, 475-478.
Astronomy and Astrophysics
Astronomy
3
Stars: Dd Mon, Binaries: Eclipsing, Stars: Fundamental Parameters
Scientific paper
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 \cite[Yamasaki et al. (1990)]{ya90}. 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 \cite[Yamasaki et al.'s (1990)]{ya90} spectroscopic results, absolute quantities of DD Mon are derived: mass of the primary M1=1.05 +/- 0.08 M_{\odot}, mass of the secondary M2=0.47 +/- 0.04 M_{\odot}, radius of the primary R1=1.36 +/- 0.04 R_{\odot}, radius of the secondary R2=1.03 +/- 0.03 R_{\odot}. 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. Tables 1 and 2 are only available electronically at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html
Gu Sheng-hong
Huang Zhangkui
Liu Qingyao
Qian Shengbang
Yang Yulan
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