This work was supported in part by the Swiss National Fondation for Scientific Research. I thank Fabien Carrier for his update of the database of Ap stars, which was widely used, and Dr. Georges Meynet for the code which allowed me to compute stellar moments of inertia. Daniel Erspamer computed the visual absorptions and Dr. Laurent Eyer provided a list of new periods of Ap stars obtained with Hipparcos. This research has made use of the Simbad database, operated at CDS, Strasbourg, France. I thank the referee for his constructive criticism.
© European Southern Observatory (ESO) 1998
Online publication: May 12, 1998