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Astron. Astrophys. 317, 942-948 (1997)
Acknowledgements
We thank Dr. M. Schüssler for valuable comments on
the manuscript and Dr. F. V. Hessman for help with the
English. The Gregory Coudé Telescope is operated by the
Universitäts-Sternwarte Göttingen at the Spanish
Observatorio del Teide/Tenerife of the
sica de Canarias. Instituto de
Astrof
© European Southern Observatory (ESO) 1997
Online publication: July 8, 1998
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