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Astron. Astrophys. 355, 994-1002 (2000) AcknowledgementsThis research was supported through `Proyecto FONDECYT 3980032'. I thank Tom Richtler and Boris Dirsch for interesting discussions, and the referee for very helpful comments that improved the paper.
© European Southern Observatory (ESO) 2000 Online publication: March 21, 2000 ![]() |