A&A Supplement series, Vol. 128, Mars I 1998, 265-275
Received March 26; accepted July 21, 1997
E. Masana - C. Jordi - H.M. Maitzen - J. Torra
Send offprint request: E. Masana
Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Avda. Diagonal 647, E-08028 Barcelona, Spain
Institut für Astronomie, Universität Wien, Türkenschanzstrae 17, A-1180 Wien, Austria
The aim of this work is to study the capacity of the system for detecting the chemically peculiar (CP) stars based on the effect that peculiar features in the flux distribution have on all the Strömgren-Crawford indices.
Our study focuses on the classical magnetic peculiar stars (CP2), though Am stars (CP1) are also included for comparison with cool CP2 stars. Satisfactory results were obtained for hot CP2 stars: the definition of a new index p, which is a linear combination of colours, allowed us to separate a high percentage of hot CP2 stars from normal stars. According to this new index, 60 new CP2 candidates are proposed.
The working sample was extracted from The General Catalogue of Ap and Am stars by Renson et al. (1991). Photometric observations to enlarge the sample of CP2 stars with complete photometry were carried out. These observations are also reported in the present paper.
The new index p is also used to correct the reddening of early CP2 stars computed as if they were normal stars.
keywords: stars: chemically peculiar -- stars: fundamental parameters -- stars: early type