Period Changes of Two W UMa-Type Contact Binaries: RW Comae Berenices and CC Comae Berenices

Details Period Changes of Two W UMa-Type Contact Binaries: RW Comae Berenices and CC Comae Berenices Period Changes of Two W UMa-Type Contact Binaries: RW Comae Berenices and CC Comae Berenices

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003pasp..115..748y&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 115, Issue 808, pp. 748-754.

Astronomy and Astrophysics

Astronomy

12

Stars: Binaries: General, Stars: Individual: Constellation Name: Cc Comae, Stars: Individual: Constellation Name: Rw Comae

Scientific paper

From the present times of minimum light and those collected from the literature, changes in the orbital period of the two W UMa-type contact binaries RW Com and CC Com are analyzed. The results reveal that the period changes of these two systems show the same natures, with a short-term oscillation superposed on the secular decrease. For RW Com, its period shows a secular decrease at a rate of dP/dt=0.43×10-7 days yr-1. An oscillation with a periodicity of 13.7 yr and an amplitude of ΔP=5.4×10-7 days is superposed on the secular decrease. For CC Com, its period shows a secular decrease at a rate of dP/dt=0.40×10-7 days yr-1. An oscillation with a periodicity of 16.1 yr and an amplitude of ΔP=2.8×10-7 days is superposed on the secular decrease. The period secular decreases of the two systems may be explained by a mass-transfer rate of dm/dt=0.29×10-7 Msolar yr-1 for RW Com and dm/dt=0.52×10-7 Msolar yr-1 for CC Com. The period short-term oscillations of the two systems may be explained by the magnetic activity cycle model given by Applegate, and the parameters for the magnetic activity cycle model are presented.

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