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Table 1

Parameters for the time-dependent RH model of λ Cep (see text).

Name Parameter Value

Spectral type O6 I(n) fp
Effective temperature Teff 36 000 K
Stellar radius R   21.1 R
Surface gravity log g 3.55
Stellar luminosity log L/L 5.83
Terminal speed 3 2200 km   s-1
Mass-loss rate 1.5    ×  10-6   M/yr
Helium abundance YHe ≡ nHe/nH 0.1
CAK exponent αCAK 0.7
Initial Langevin 3turb/3sound 0.5
turbulence fluctuation

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