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CK Bootis: a W UMa system with a small mass ratio
We present an analysis of BVR light curves of an eclipsing binary {CKBootis}, a system with a very small mass ratio. The light curves appearto exhibit a typical O'Connell effect. The light curves are analyzed bymeans of the latest version of the WD program. The asymmetry of thelight curves is explained by a cool star spot model. The simultaneousBVR synthetic light curve analysis gives a tiny mass ratio of 0.12, anextremely large fill-out factor of 0.65, and a very small differencebetween the component temperatures of 90 K. The absolute parameters ofthe system were also derived by combining the photometric solutions withthe radial velocity data. The mass of the secondary is very low (0.15M_ȯ) and it continues losing mass. Thirty seven new times ofminimum are reported. It is found that the orbital period of the systemhas a quasi periodic variation, superimposed on a period increase. Thelong-term period increase rate is deduced to be dP/dt = 3.54 x10-7 d yr-1, which can be interpreted as being dueto mass transfer from the less massive star to the more massivecomponent.
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