CAOSP abstracts, Volume: 31, No.: 1, year: 2001

Abstract: New photoelectric BV observations of the eclipsing contact systems EF Dra, GW Cep and CW Cas obtained in autumn 2000 are presented and analyzed. A photometric solution of CW Cas indicates the poor thermal contact of the components. Photometric elements of EF Dra determined from our light curves combined with published spectroscopic elements yield the absolute parameters of the components: m_1 = 1.81 +/- 0.10 M_Sun, m_2 = 0.29 +/- 0.03 M_Sun, R_1 = 1.701 +/- 0.026 R_Sun and R_2 = 0.778 +/- 0.012 R_Sun. The detected third light in EF Dra is used to estimate the mass of the third body m_3 approx. 0.75 M_Sun as well as its K1-2 spectral type. The observed period changes of the eclipsing pair indicate either a 1360 days or more than 12 years orbital period of the third body. The observed period decreases in GW Cep and CW Cas are probably influenced by the presence of their third bodies.

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