CAOSP abstracts, Volume: 31, No.: 1, year: 2001
- Author(s): PRIBULLA, T.; VANKO, M.; CHOCHOL, D.; PARIMUCHA, S.
- Journal: Contributions of the Astronomical Observatory Skalnate Pleso,
vol. 31, no. 1, p. 26-42.
- Date: 04/2001
- Title: Photoelectric photometry of the eclipsing contact binaries: EF Dra, GW Cep and CW Cas
- Keyword(s): CONTACT BINARIES, PHOTOMETRY, ORBITAL PERIOD
- Pages: 26 -- 42
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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