A&A Supplement series, Vol. 128, March II 1998, 573-580
Received July 17; accepted September 3, 1997
H.M. Maitzen - R. Pressberger - E. Paunzen
Send offprint request: H.M. Maitzen
Institut für Astronomie der Universität Wien, Türkenschanzstr. 17, A-1180 Wien, Austria e-mail: email@example.com
We have observed 131 stars of Renson's (1991) catalogue of Ap and Am stars both in the Strömgren & Maitzen's (1976) system as a contribution to the photometric studies of the broad band flux depression feature in chemically peculiar stars. With few exceptions the probability grouping of Renson for membership in the CP2 group of peculiar stars is nicely reflected by peculiar values of . Comparison with already available values yields slightly larger values due to a minor shift in the filter g1 sampling the depression. As found by Maitzen & Vogt (1983) the Geneva system peculiarity parameters correlate well with . This study demonstrates the advantageous performance of a photoelectric photometer with a rapidly rotating filter wheel moving in a stop and go mode.
keywords: stars; chemically peculiar -- stars; early type