Abstract
view Abstract Citations (30) References (39) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Wind-Wind Interaction in the Close Wolf-Rayet Binary CQ Cephei (WN6+O9 II--Ib) Marchenko, S. V. ; Moffat, A. F. J. ; Eenens, P. R. J. ; Hill, G. M. ; Grandchamps, A. Abstract 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. Publication: The Astrophysical Journal Pub Date: September 1995 DOI: 10.1086/176186 Bibcode: 1995ApJ...450..811M Keywords: STARS: BINARIES: ECLIPSING; STARS: EARLY-TYPE; STARS: FUNDAMENTAL PARAMETERS; STARS: WOLF-RAYET full text sources ADS | data products SIMBAD (6)
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