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Results of mode identification and seismic modelling of the $\beta$ Cep/SBPstar 12 Lacertae are presented. Using data on the multi-colour photometry andradial velocity variations, we determine or constrain the mode degree, $\ell$,for all pulsational frequencies. Including the effects of rotation, we showthat the dominant frequency, $\nu_1$, is most likely a pure $\ell=1$ mode andthe low frequency, $\nu_A$, is a dipole retrograde mode. We construct a set ofseismic models which fit two pulsational frequencies corresponding to the modes$\ell= 0,$ p$_1$ and $\ell= 1,$ g$_1$ and reproduce also the complex amplitudeof the bolometric flux variations, $f$, for both frequencies simultaneously.Some of these seismic models reproduce also the frequency $\nu_A$, as a mode$\ell= 1,$ g$_{13}$ or g$_{14}$, and its empirical values of $f$. Moreover, itwas possible to find a model fitting the six 12 Lac frequencies (the first fiveand $\nu_A$), only if the rotational splitting was calculated for a velocity of$V_{\rm rot}\approx 75$ km/s. In the next step, we check the effects of modelatmospheres, opacity data, chemical mixture and opacity enhancement. Ourresults show that the OP tables are preferred and an increase of opacities inthe $Z-$bump spoils the concordance of the empirical and theoretical values of$f$.

The $\beta$ Cep/SPB star 12 Lacertae: extended mode identification and complex seismic modelling