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Astron. Astrophys. 347, L31-L34 (1999) AcknowledgementsWe whish to thank the referee, J. Greiner for his valuable comments and suggestions. We are also indebted to M. Tafalla for his valuable support at the 1.5-m OAN telescope. We are very grateful to Eliana Palazzi and Nicola Masseti for valuable information on the calibration stars. This work has been partially supported by Spanish CICYT grant ESP95-0389-C02-02.
© European Southern Observatory (ESO) 1999 Online publication: June 30, 1999 ![]() |