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Astron. Astrophys. 330, 533-540 (1998) AcknowledgementsWe acknowledge the support received from the Spanish DGICYT through project PB93-0134. This research has made use of the Simbad database, operated at CDS, Strasbourg, France. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: January 16, 1998 ![]() |