Astron. Astrophys. 328, 390-398 (1997)

Acknowledgements

The authors are indebted to Drs. L. Vlahos, H. Aurass, G. Mann, and A.V. Stepanov for useful discussions and to the unknown referee for helpful comments. One of the authors (V.V.Z.) would like to thank for the hospitality received during his stay at the Astrophysical Institute Potsdam. The work was supported by the Russian Foundation of Basic Research, by INTAS, and by the Deutsche Agentur für Raumfahrtangelegenheiten (DARA grants 50 QL 9208, 50 QL 9301, 50 QL 9602).

© European Southern Observatory (ESO) 1997

Online publication: March 24, 1998

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