Astron. Astrophys. 324, 566-572 (1997)

Acknowledgements

This investigation has been supported by the Austrian Fonds zur Förderung der wissenschaftlichen Forschung, project number S7304. Observations at Mt. Suhora Observatory were supported in part by the Polish National Committee for Scientific Research Grant 2-P03D-015-08. The Hungarian research grant OTKA No. T021074 is acknowledged. It is a pleasure to thank K. Krisciunas for extensive discussions.

© European Southern Observatory (ESO) 1997

Online publication: May 26, 1998

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