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Astron. Astrophys. 331, 949-958 (1998) AcknowledgementsAFJM is grateful for financial assistance from NSERC (Canada) and FCAR (Quebec). WSeg gratefully acknowledges financial support from the German Bundesminister für Forschung und Technologie (FKZ 50009101). JPDC contributed to this work in the framework of the project IUAP P4/05, financed by the Belgian State (DWTC/SSTC). We thank the referee, A. Blaauw, for useful criticisms. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: March 3, 1998 ![]() |