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Astron. Astrophys. 324, 80-90 (1997) AcknowledgementsVR acknowledges support from French Ministere de la Recherche et de la Technologie during his stay in Paris. This research has made use of the NASA/IPAC Extragalactic Database (NED) and of the Lyon-Meudon Extragalactic Database (LEDA) supplied by the LEDA team at the CRAL-Observatoire de Lyon (France). ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1997 Online publication: May 26, 1998 ![]() |