Amplitude of the vertical component of the meridional circulation velocity in cm per second in a 15 M_⊙ model at various stages. The dashed lines correspond to a rotating model with υ_ini = 0.6 υ_crit and are computed without tidal interaction. The continuous lines show the situation when tidal interactions are accounted for, assuming a close companion of 10 M_⊙ orbiting the primary with an initial period of 1.4 days. Different ages are plotted with different colors as indicated in the inset, for both the continuous and dashed lines. The different colors have the same meaning as in Fig. 2.