Photometric parameters for rotating models of A- and F-type stars

We have computed the photometric magnitudes of rotating atmospheres-based o n the simple model of Collins-for a grid suitable for main-sequence and sli ghtly evolved stars of spectral type AO to F5. A gravity-darkening law vali d for radiative and convective envelopes has been considered. The general r esults are given as magnitude differences between rotating and non-rotating copartners to allow for the use of any photometric ic calibration. A simpl e interpolation on these results gives the photometric parameters for inter ior rotating models but Me also indicate how they can he used to correct fo r the effect of rotation when an investigation with non-rotating models is carried out. We illustrate the procedure with the interesting case of the P raesepe Cluster.