SIMBAD references

16 (EN) Lacertae is a single-lined spectroscopic binary and an eclipsing variable. It consists of the well-known β Cephei star and an invisible secondary. Four pulsation modes, including a radial one, are found to be simultaneously present in the β Cephei primary. We consider all possible identifications of the observed pulsation frequencies with the computed ones for low-degree modes (l≤2) in a series of stellar models covering the range of T_eff and mean density consistent with the best available data. Only models allowing no overshooting are taken into account and with this restriction the conclusion that the rotation rate increases inward is unavoidable. There are ambiguities in the identification of the modes. We recommend observations that should enable a unique identification and, as a result, yield precise model parameters and better constraints on the differential rotation.