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Astron. Astrophys. 341, 768-783 (1999) AcknowledgementsWe thank the referee, Christopher Johns-Krull, for his insightful comments that helped us to more clearly present the method. We are grateful to the staff of the William Herschel Telescope for all their help and assistance during the observations. We also thank Gibor Basri, and Steve Saar for many fruitful discussions during the preparation of this paper. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1999 Online publication: December 16, 1998 ![]() |