Observational characteristics of simple radial and non-radial β Cephei models

Light, colour and radial velocity variations are calculated for radially oscillating models applicable to β Cephei stars. Tentative non-radial calculations are also presented. A comparison with published ΔV, Δ(U-B) and 2K data for these variables is made. The observed ΔV/Δ(U-B) data suggest the presence of both radial and non-radial oscillations in the β Cephei stars. Line profile variations in the star 12 Lac are compared with the predictions of (1,m) = (2,-2) and (2,0) oscillations and a reasonable agreement is obtained. However, a full hydrodynamic treatment of the oscillations will probably be required to obtain satisfactory models of radial velocity variations . (author)