P10	October 1997

¹ Institut d'Astrophysique et de Géophysique - Université de Liège, Avenue de Cointe 5, 4000 Liège, Belgium

^* Aspirant FNRS, Belgium
^** Directeur de Recherche FNRS, Belgium

⁺ Based on observations collected at the European Southern Observatory (La Silla, Chile)

Abstract

     We present here tests of a five-filter photometric system aimed at WR classification. In addition to the well-known easy separation between the WN and WC spectral types, these tests indicate interesting potentialities in the discrimination of subgroups amoung the WN and the WC which look well related to the classical sub-types. The proposed combinations of filters (or derived ones) bear enough discriminating power to satisfy some evolutionary studies in crowded fields where spectroscopic follow-up is not possible