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A&A Supplement series, Vol. 128, March II 1998, 573-580

Received July 17; accepted September 3, 1997

tex2html_wrap_inline1063 and Strömgren photometry of stars in the Renson-catalogue of Ap and Am starsgif

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:


We have observed 131 stars of Renson's (1991) catalogue of Ap and Am stars both in the Strömgren & Maitzen's (1976) tex2html_wrap_inline1063 system as a contribution to the photometric studies of the tex2html_wrap_inline1069 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 tex2html_wrap_inline1063. Comparison with already available tex2html_wrap_inline1063 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 tex2html_wrap_inline1063. 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

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