A&A Supplement Ser., Vol. 124, August 1997, 291-298
Received April 10; accepted November 18, 1996
P.G. Niarchos
- M. Hoffmann
- H.W.Duerbeck
Send offprint request: P.G. Niarchos
Section of Astrophysics, Department of Physics, University of Athens,
Panepistimiopolis, GR-15784 Zografos, Athens, Greece
Alter Weg 7, D-54570 Weidenbach, Germany
European Southern Observatory, Casilla 19001, Santiago 19, Chile
Astronomisches Institut,
Wilhelm-Klemm-Str. 10, D-48149 Münster, Germany
A photometric analysis of the W UMa systems V 700 Cyg and AW Vir,
based on photoelectric B and V light curves, is presented. Since no
spectroscopic mass-ratio is available, the q-search method was applied
to find the preliminary range of the mass-ratio in order to search for the
final solution. First, an unspotted solution was carried out by using
the unperturbed parts of the light curves and applying the DC program
of the WD code. The final spotted solution was made by adopting spot models
for the two systems. In the case of V 700 Cyg, two cool spots were placed
on the primary (more massive, larger and cooler) component to explain
the O'Connell effect (
fainter than 
) and a small
deficit of light just before 
. In the case of AW Vir,
one cool spot was placed on the primary component to explain
the relatively large O'Connell effect. Both objects are
W-type systems with partial eclipses; V 700 Cyg is fairly evolved
while AW Vir is rather unevolved.
keywords: stars: V 700 Cyg, AW Vir -- binaries: eclipsing -- starspots