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Astron. Astrophys. 331, 737-741 (1998) AcknowledgementsWe thank the referee, Dr. J. L. Leroy, for useful comments. This research has made use of the Simbad database maintained at CDS, Strasbourg, France. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: February 16, 1998 ![]() |