Astron. Astrophys. 339, 215-224 (1998)
Acknowledgements
V.M. ade
is grateful to the 'Onderzoeksfonds K.U.Leuven' for awarding him the
senior research fellowship (F/97/9). Á. Csík is grateful
to the Hungarian Soros Foundation, the "Onderzoeksfonds K.U.Leuven"
and to the Hungarian Airlines Company for the financial support. The
authors are also thankful to M.Ruderman for valuable discussions on
the considered subject.
© European Southern Observatory (ESO) 1998
Online publication: September 30, 1998
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