Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26as..128..265m&link_type=abstract
Astronomy and Astrophysics Supplement, v.128, p.265-275
Astronomy and Astrophysics
Astrophysics
9
Stars: Chemically Peculiar, Stars: Fundamental Parameters, Stars: Early Type
Scientific paper
The aim of this work is to study the capacity of the uvby H_β system for detecting the chemically peculiar (CP) stars based on the effect that peculiar features in the flux distribution have on all the Stromgren-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 uvby H_β 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 \cite[Renson et al. (1991)]{ren91}. Photometric observations to enlarge the sample of CP2 stars with complete uvby H_β 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. Tables 2, 3 and 7 are also available in electronic form from CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html
Jordi Carme
Maitzen Hans Michael
Masana Eduard
Torra Jordi
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