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Astron. Astrophys. 324, 177-184 (1997) AcknowledgementsWe would like to thank Prof. J. Landstreet, Drs. C. Catala and J.-F. Donati for many fruitful discussions. We are indebted to the Calar Alto staff for assistance during the observing run.
© European Southern Observatory (ESO) 1997 Online publication: May 26, 1998 ![]() |