The light curve of the eclipsing binary system CX Cephei and the properties of the Wolf-Rayet component

Astronomy and Astrophysics – Astronomy

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Cepheid Variables, Companion Stars, Eclipsing Binary Stars, Light Curve, Wolf-Rayet Stars, Brightness Temperature, Stellar Evolution, Stellar Luminosity, Stellar Structure, Stellar Temperature

Scientific paper

Photoelectric B, V, R photometry of the eclipsing Wolf-Rayet binary CX Cep (WN 5 + O8 V, V = 12.1 m, P = 2.127d) is reported. Analysis of the integrated (broad band) light curve (effective wavelength of about 6000 A) yields physical parameters of the WN 5 star: core radius of 4.5 + or - 2.5 solar radii and core brightness temperature greater than 50,000 K, values nearly the same as those for the WN 5 component of the eclipsing WR binary V444 Cyg. The light curves of these two systems have an interpretation consistent with the theory for the evolution of massive close binaries.

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