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We present interpretation of the oscillation spectrum of the early B-typestar $\gamma$ Pegasi, in which both low order p/g and high-order g-modes areobserved. Using amplitudes and phases of the photometric and radial velocityvariations, we identify/constrain the mode degree, $\ell$, for all 14 detectedfrequencies. Seismic models fitting two pulsational frequencies correspondingto the modes $\ell=0$, p$_1$ and $\ell=1$, g$_1$ were constructed. This set ofmodels contains those which reproduce also the empirical values of the complexnonadiabatic parameter $f$ associated to these two mode frequencies.Unfortunately, there are no models reproducing the values of $f$ for bothfrequencies simultaneously, regardless of model atmospheres, opacity data,chemical mixture as well as opacity enhancement in the $Z-$ and Deep OpacityBumps. Most probably, some modifications of the opacities in stellar interiorsare still required.

The hybrid B-type pulsator $\gamma$ Pegasi: mode identification and complex seismic modelling