V781 Tau: Improved Evidence for an Orbital Period Change

Details V781 Tau: Improved Evidence for an Orbital Period Change V781 Tau: Improved Evidence for an Orbital Period Change

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003ibvs.5391....1d&link_type=abstract

Information Bulletin on Variable Stars, 5391, 1.

Physics

2

Photometry, Period Change

Scientific paper

V781 Tau (=SAO 077615) is a G0 over-contact binary with an orbital period that is changing with time. Liu and Yang (2000) proposed a quadratic orbital ephemeris with the binary period changing with time. They analysed observations from the literature and added two minima obtained in 1997 and 1998. These two points proved crucial for the determination of the parabolic term of the ephemeris and need robust confirmation by extending measurements of the times of minima well into the descending branch of the parabolic approximation. We report here on 10 additional minima secured between Nov-2001 and Jan-2003 to the aim of confirming the trend and strengthen the solution. Our results fully confirm the orbital ephemeris of Liu and Yang.

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