Evolutionary tracks relevant for our three stars. The models in the bottom figures include overshooting, the ones at the top do not. Left: tracks of 40 to 55 M_⊙ computed with a mass-loss rate of 6.0 × 10^-8 M_⊙   yr^-1. The error boxes of HD 46223 (the hotter star) and HD 46150 (the cooler star) are also displayed. To show that both stars can be modelled by the same mass-loss rate without affecting the excited frequency domain, we also plot a 49 M_⊙ track computed with Ṁ = 6.8 × 10^-8   M_⊙   yr^-1 (magenta-coloured line). Right: same, but for HD 46966 computed with a mass-loss rate of 5.0 × 10^-9M_⊙   yr^-1. The full circles indicate positions along the tracks that have excited frequencies.