Astron. Astrophys. 355, 607-616 (2000)

Acknowledgements

This research project was supported by the Deutsche Forschungsgemeinschaft DFG, grant 436 BUL 113/88/0. In addition, M. Altmann is grateful to the DFG for grant Bo 779/21. K.P. Panov kindly acknowledges the support by the Bulgarian National Science Foundation, grant F 826. Thanks are due to J.S.W. Stegert for his participation in the observations. The authors are thankful to the referee Dr. A.F.J. Moffat for his fruitful suggestions. For our research we made with pleasure use of the SIMBAD data base in Strasbourg.

© European Southern Observatory (ESO) 2000

Online publication: March 9, 2000
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