Astron. Astrophys. 326, 647-654 (1997)

Acknowledgements

G. M. and S. S. acknowledge financial support from GNA-CNR, and MURST (Ministero della Università e della Ricerca Scientifica e Tecnologica). We have extensively used the Simbad database in the course of the present work, and the IRAF software system for the data reduction. We would like to thank E. Feigelson for some very useful discussions on the subject matter of this paper, as well as R. Pallavicini for some useful comments on an early draft. We also thank the referee, L. W. Hartmann, for the useful comments which have helped to improve the paper.

© European Southern Observatory (ESO) 1997

Online publication: October 15, 1997
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