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We present the results of a spectroscopic multisite campaign for the β Cephei star 12 (DD) Lacertae. Our study is based on more than thousand high‐resolution high S/N spectra gathered with eight different telescopes in a time span of 11 months. In addition, we make use of numerous archival spectroscopic measurements. We confirm 10 independent frequencies recently discovered from photometry, as well as harmonics and combination frequencies. In particular, the slowly pulsating B‐stars (SPB)‐like  g ‐mode with frequency 0.3428 d −1  reported before is detected in our spectroscopy. We identify the four main modes as  (ℓ 1 ,  m  1 ) = (1, 1), (ℓ 2 ,  m  2 ) = (0, 0), (ℓ 3 ,  m  3 ) = (1, 0)  and  (ℓ 4 ,  m  4 ) = (2, 1)  for   f  1 = 5.178 964 d −1 ,  f  2 = 5.334 224 d −1 ,  f  3 = 5.066 316 d −1   and   f  4 = 5.490 133 d −1  , respectively. Our seismic modelling shows that  f  2  is likely the radial first overtone and that the core overshooting parameter  α ov   is lower than 0.4 local pressure scale heights.

An asteroseismic study of the β Cephei star 12 Lacertae: multisite spectroscopic observations, mode identification and seismic modelling