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Astron. Astrophys. 318, 819-834 (1997) AcknowledgementsWe thank the European Southern Observatory for generous allocation of observing time and the staff at La Silla, Calar Alto, and Tautenburg Observatories for the kind assistance during the observations. We are grateful to Alex Fullerton for his comments on this work. This work was supported by the Deutsche Forschungsgemeinschaft (Wo 296/16-1/2). ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1997 Online publication: July 3, 1998 ![]() |