Other
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aspc..447..197h&link_type=abstract
Evolution of compact binaries. Proceedings of a workshop held at Hotel San Martín, Viña del Mar, Chile 6–11 May 2011. ASP Confe
Other
Scientific paper
V471 Tau is a pre-cataclysmic, post-common envelope binary consisting of a white dwarf and a main sequence star with an orbital period of 0.521183439 days. The eclipses in the system are characterised by a fast drop to minimum as well as by a fast increase from minimum. Recently we analysed the (O-C) diagram of this system (Kundra & Hric 2010) and solved the long-term problem of its behaviour. We showed that it is only possible to explain this behaviour by assuming the presence of a third body in the system. Our solution indicates a brown dwarf in an eccentric orbit with a period of 33.2 years. Analysing the (O-C) diagram in detail we noticed additional variations most pronounced in the residuals after the subtraction of the third body influence. One possible explanation are spots on the red dwarf surface, which can produce a deformation of the minima as well as affect the accuracy of the times of these minima. The other possibility is that there is another body in the system, i.e. an extrasolar planet.
Hric Ladislav
Kundra E.
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