A&A Supplement Series, Vol. 125, November I 1997, 407-417
Received January 2, 1996; accepted January 20, 1997
A. Akalin - E. Derman
Ankara University Observatory, Science Faculty, Tandogan 06100, Ankara, Turkey
A complete period variation analysis and new light curves of V 839 Oph
together with new ephemeris data are presented. The period variation was
found to be . The period
increment
indicates that the conservative mass transfer rate from the less massive
component to the more massive one is
. We
fitted parabolic and we discuss the possible detection of sinusoidal curves
to the (
) diagram and sinusoidal oscillations with period of
about
and semi-amplitude of 0.0065 day.
A simultaneous solution of the B and V light curves was computed using the
Wilson-Devinney synthetic light-curve code. The light curve solution
indicates that the A-type W UMa-type system is in contact with a
filling factor of .
keywords: binaries: eclipsing -- stars: individual: V 839 Oph