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Astron. Astrophys. 342, 167-172 (1999) AcknowledgementsThis research was supported by the Belgian Fund for Scientific Research (FWO) and by the Flemish Ministry for Foreign Policy, European Affairs, Science and Technology. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France. The authors thank Dr. Barthès, the referee, for carefully reading the manuscript. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1999 Online publication: December 22, 1998 ![]() |