Astron. Astrophys. 322, 511-522 (1997)

Acknowledgements

KGS is very grateful to the Austrian Fond zur Förderung der wissenschaftlichen Forschung for support under grant S7302-AST and S7301-AST, and JBR acknowledges the support from the Natural Sciences and Engineering Research Council of Canada.

© European Southern Observatory (ESO) 1997

Online publication: June 5, 1998

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