2013MNRAS.432..822W

We present an interpretation of the oscillation spectrum of the early B-type star γ Pegasi, in which both low-order p/g and high-order g-modes are observed. Using amplitudes and phases of the photometric and radial velocity variations, we identify/constrain the mode degree, ℓ, for all 14 detected frequencies. Seismic models fitting two pulsational frequencies corresponding to the modes ℓ = 0, p1 and ℓ = 1, g1 were constructed. This set of models contains those which reproduce also the empirical values of the complex non-adiabatic parameter f associated with these two mode frequencies. Unfortunately, there are no models reproducing the values of f for both frequencies simultaneously, regardless of model atmospheres, opacity data, chemical mixture as well as opacity enhancement in the Z- and deep opacity bumps. Most probably, some modifications of the opacities in stellar interiors are still required.