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Astron. Astrophys. 342, 257-270 (1999) AcknowledgementsC. Lada and J. Alves gratefully acknowledge support from a Smithsonian Scholarly Studies Grant. M. Walmsley acknowledges travel support from CNR grant 97.00018 CT02 and ASI grant ARS-96-66 during the cause of this work. The authors appreciate the valuable comments of P. Caselli and R. Simon. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1999 Online publication: December 22, 1998 ![]() |