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Astron. Astrophys. 319, 607-616 (1997) AcknowledgementsWe thank V. Bujarrabal and D. Downes for useful comments and suggestions. This work has been partly supported by the Spanish DGICYT under grant PB93-48. A.B. acknowledges support from the CNRS URA No. 352. J.C. acknowledges the Bordeaux University for a temporary professorship at the Bordeaux Observatory during the completion of this work
© European Southern Observatory (ESO) 1997 Online publication: July 3, 1998 ![]() |