Wind-Wind Interaction in the Close Wolf-Rayet Binary CQ Cephei (WN6+O9 II--Ib)

Details Wind-Wind Interaction in the Close Wolf-Rayet Binary CQ Cephei (WN6+O9 II--Ib) Wind-Wind Interaction in the Close Wolf-Rayet Binary CQ Cephei (WN6+O9 II--Ib)

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...450..811m&link_type=abstract

Astrophysical Journal v.450, p.811

Astronomy and Astrophysics

Astronomy

25

Stars: Binaries: Eclipsing, Stars: Early-Type, Stars: Fundamental Parameters, Stars: Wolf-Rayet

Scientific paper

A large collection of blue and yellow CCD spectra of the short-period eclipsing binary CQ Cep allows us to improve the double-line (SB2) orbit of Kartasheva & Snezhko and reclassify the system as WN6+O9 II-Ib. With orbital inclination i = 78° 65°, the masses and radii are Msun = 18-23 Msun, MWR = 15-19 Msun, R0 ≤ 10 Rsun, 2 Rsun ≤ RWR ≤ 10 Rsun. For its spectral type, the 0 star mass and radius are smaller than values deduced from evolutionary models but agree with recent determinations of other O stars in binaries. The W-R star is shown to contain a small amount of hydrogen in its wind.
Because of the rapid orbit revolution compared to the wind velocities, the wind interaction zone is tightly wrapped around the system. We construct a phenomenological model which explains the numerous phase-dependent spectral variations.

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