Astron. Astrophys. 336, 743-752 (1998)

Acknowledgements

This work was supported by a scholarship from the University of Istanbul. Thanks are due to R. Volkmer and S. Steffens for their assistance with the data reduction and for valuable discussions. The co-operation of C. Denker and J. Krieg in obtaining the observations is gratefully acknowledged. The Vacuum Tower Telescope at the Spanish Observatorio del Teide of the Instituto de Astrofísica de Canarias/Tenerife is operated by the Kiepenheuer-Institut für Sonnenphysik in Freiburg, Germany.

© European Southern Observatory (ESO) 1998

Online publication: July 20, 1998
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