UBV photometry and period variations of V 839 Ophiuchi

Details UBV photometry and period variations of V 839 Ophiuchi UBV photometry and period variations of V 839 Ophiuchi

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26as..125..407a&link_type=abstract

A & A Supplement series, Vol. 125, November I 1997, 407-417.

Astronomy and Astrophysics

Astronomy

23

Binaries: Eclipsing, Stars: Individual: V 839 Oph

Scientific paper

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 dP/dt=3.1x10^{-7} d/yr. The period increment indicates that the conservative mass transfer rate from the less massive component to the more massive one is 6.5x10^{-7} M_{\sun}/yr. We fitted parabolic and we discuss the possible detection of sinusoidal curves to the (O-C) diagram and sinusoidal oscillations with period of about 20 yr 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 ~39%. Table 2 and Table 5 only available in electronic form: see the Editorial in A&AS 1994, Vol. 103, No. 1.

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