Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26as..128..573m&link_type=abstract
Astronomy and Astrophysics Supplement, v.128, p.573-580
Astronomy and Astrophysics
Astrophysics
12
Stars, Chemically Peculiar, Early Type
Scientific paper
We have observed 131 stars of \cite[Renson's (1991)]{re91} catalogue of Ap and Am stars both in the Stroemgren & Maitzen's (1976) Delta a system as a contribution to the photometric studies of the lambda 5200 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 Delta a. Comparison with already available Delta a values yields slightly larger values due to a minor shift in the filter g_1 sampling the depression. As found by \cite[Maitzen & Vogt (1983)]{ma83} the Geneva system peculiarity parameters correlate well with Delta a. This study demonstrates the advantageous performance of a photoelectric photometer with a rapidly rotating filter wheel moving in a stop and go mode. Tables 3 and 4 are also available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html
Maitzen Hans Michael
Paunzen E. E.
Pressberger R.
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