  The magnetic chemically peculiar (CP2) stars of the upper main sequence are
well-suited for investigating the impact of magnetic fields on the surface
layers of stars, which leads to abundance inhomogeneities (spots) resulting in
photometric variability. The light changes are explained in terms of the
oblique rotator model; the derived photometric periods thus correlate with the
rotational periods of the stars. CP2 stars exhibiting this kind of variability
are classified as alpha2 Canum Venaticorum (ACV) variables. We have analysed
around 3 850 000 individual photometric WASP measurements of magnetic
chemically peculiar (CP2) stars and candidates selected from the Catalogue of
Ap, HgMn, and Am stars, with the ultimate goal of detecting new ACV variables.
In total, we found 80 variables, from which 74 are reported here for the first
time. The data allowed us to establish variability for 23 stars which had been
reported as probably constant in the literature before. Light curve parameters
were obtained for all stars by a least-squares fit with the fundamental sine
wave and its first harmonic. Because of the scarcity of Stroemgren uvbybeta
measurements and the lack of parallax measurements with an accuracy better than
20%, we are not able to give reliable astrophysical parameters for the
investigated objects.

Solar and Stellar Astrophysics