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Astron. Astrophys. 329, 443-450 (1998) AcknowledgementsWe thank M. Guélin for critically reading the manuscript. Y.-N. Chin thanks for financial support through DAAD (Deutscher Akademischer Austauschdienst) grant 573 307 0023 and through National Science Council of Taiwan grant 86-2112-M001-032 . R. Mauersberger acknowledges support as a Heisenberg fellow by the Deutsche Forschungsgemeinschaft (DFG).
© European Southern Observatory (ESO) 1998 Online publication: December 8, 1997 ![]() |