Spectroscopic and photometric analysis of the WN7 eclipsing binary CQ Cephei

Details Spectroscopic and photometric analysis of the WN7 eclipsing binary CQ Cephei Spectroscopic and photometric analysis of the WN7 eclipsing binary CQ Cephei

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...265..961l&link_type=abstract

Astrophysical Journal, Part 1, vol. 265, Feb. 15, 1983, p. 961-971. Research supported by the University of Nebraska, Natural S

Astronomy and Astrophysics

Astrophysics

43

Cepheid Variables, Eclipsing Binary Stars, Stellar Spectrophotometry, Wolf-Rayet Stars, Absorption Spectra, Balmer Series, Electrophotometry, Light Curve, Mass To Light Ratios, Orbital Elements, Radial Velocity, Stellar Atmospheres, Stellar Envelopes, Stellar Luminosity, Stellar Spectra, Stellar Structure

Scientific paper

Spectroscopic observations made at Kitt Peak in September 1978 are used in analyzing the orbit of the WN7 eclipsing binary CQ Cep. The Wolf-Rayet emission lines and their biolet-displaced absorption edges reveal a circular orbit with a velocity amplitude (semiamplitude) of 310 km/s (N IV 4058-A emission) in the photometric 1.64d period. The violet-displaced hydrogen Balmer absorption lines are found to vary in phase with the W-R emission, indicating that they originate in the W-R atmosphere rather than in the unseen companion star. The He II 4686-A emission exhibits a heavily distorted velocity curve. The violet-displaced absorption component of the He I 3889-A line reveals a nearly constant velocity of approximately 1150 km/s, indicating its origin in a common binary system envelope.

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