Astron. Astrophys. 323, 374-381 (1997)

Acknowledgements

This paper is based on observations made with the Isaac Newton Telescope of the Royal Greenwich Observatory, operated at the island of La Palma by the Instituto de Astrofísica de Canarias. This work has been supported by the DGICYT under contracts PB90-0548 and PB91-0526. We are grateful to Prof. Alessandro Chieffi for his interesting comments and suggestions. A. Alonso and M. Salaris wish respectively to thank all the people at the Osservatorio Astronomico di Collurania, and the Instituto de Astrofísica de Canarias for their kind hospitality during the elaboration of this work.

© European Southern Observatory (ESO) 1997

Online publication: June 5, 1998

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