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A&A Supplement series, Vol. 128, Mars I 1998, 265-275

Received March 26; accepted July 21, 1997

CP2 stars as viewed by the tex2html_wrap_inline461 systemgif

E. Masana tex2html_wrap1497 - C. Jordi tex2html_wrap1497 - H.M. Maitzen tex2html_wrap1501 - J. Torra tex2html_wrap1497

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tex2html_wrap1505  Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Avda. Diagonal 647, E-08028 Barcelona, Spain
tex2html_wrap1507  Institut für Astronomie, Universität Wien, Türkenschanzstratex2html_wrap_inline1471e 17, A-1180 Wien, Austria


The aim of this work is to study the capacity of the tex2html_wrap_inline1475 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 tex2html_wrap_inline1475 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 tex2html_wrap_inline1475 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

Copyright by the European Southern Observatory (ESO)