Astron. Astrophys. 319, 648-654 (1997)

Acknowledgements

This work is supported by the Österr. Fonds zur Förderung der wissenschaftl. Forschung (FWF) under project number S7305-AST. We thank M. Feuchtinger, J. Hron, F. Kerschbaum, M. Schultheis and G. Wuchterl for many discussions concerning various theoretical and observational aspects of the paper.

© European Southern Observatory (ESO) 1997

Online publication: July 3, 1998
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