Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005an....326..342k&link_type=abstract
Astronomische Nachrichten, Vol.326, Issue 5, p.342-348
Astronomy and Astrophysics
Astronomy
4
Binaries: Eclipsing, Stars: Individual (Ck Boo), Stars: Spots
Scientific paper
We present an analysis of BVR light curves of an eclipsing binary {CK Bootis}, a system with a very small mass ratio. The light curves appear to exhibit a typical O'Connell effect. The light curves are analyzed by means of the latest version of the WD program. The asymmetry of the light curves is explained by a cool star spot model. The simultaneous BVR synthetic light curve analysis gives a tiny mass ratio of 0.12, an extremely large fill-out factor of 0.65, and a very small difference between the component temperatures of 90 K. The absolute parameters of the system were also derived by combining the photometric solutions with the radial velocity data. The mass of the secondary is very low (0.15 M_&sun;) and it continues losing mass. Thirty seven new times of minimum are reported. It is found that the orbital period of the system has a quasi periodic variation, superimposed on a period increase. The long-term period increase rate is deduced to be dP/dt = 3.54 x 10-7 d yr-1, which can be interpreted as being due to mass transfer from the less massive star to the more massive component.
Derman Emanuel
Kalci R.
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