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Astron. Astrophys. 331, 347-360 (1998) AcknowledgementsJR-G would like to express his thanks to the Deutsche Forschungsgemeinschaft (DFG) for its financial support during part of this work. GT-T gratefully acknowledges the Banco Bilbao Vizcaya foundation for a visiting professorship at the University of Cambridge. We also would like to thank Dr. T. Mahoney for a careful reading of the manuscript. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: February 4, 1998 ![]() |