Theoretical oscillation frequencies (for the κ-mechanism) computed with the MAD non-adiabatic code, as a function of the effective temperature. The results shown here do not include overshooting. Top: 52 M_⊙ track. Bottom: 30 M_⊙ track. The black points indicate models that do not show pulsations, the coloured full circles stand for those models with the excited frequencies. The l-value is colour-coded (see legend). We also indicate with vertical lines the effective temperatures of the three stars studied here, as well as HD 46149 (Degroote et al. 2010) and HD 46202 (Briquet et al. 2011).