CW Cephei - an important close binary member of the III Cephei association

Astronomy and Astrophysics – Astronomy

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B Stars, Binary Stars, Stellar Spectrophotometry, Ubv Spectra, Orbital Elements, Stellar Luminosity, Stellar Mass

Scientific paper

Yellow and blue photoelectric observations of CW Cephei are presented and new orbital elements are derived. The eccentricity of the orbit of CW Cep is computed to be e = 0.028, significantly smaller than the published spectrographic value. Variation of the orbital period indicates a period of apsidal motion of about 39 yr, the shortest one in the northern hemisphere. The absolute dimensions of this system contribute to the empirical mass-luminosity and mass-radius relations. CW Cep suggests a value of 3.0 for the ratio of total to selective absorption in the region of III Cep association.

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