Astron. Astrophys. 324, 549-555 (1997)

Acknowledgements

We thank I. Ribas for his kind collaboration in the reduction of data. We also thank J.M. Paredes, D. Galadí-Enríquez and I. Ribas for their collaboration in the observations. We appreciate the constructive comments by our anonymous referee. The 1.23 m and 2.20 m telescopes are operated by the Max-Planck Institut für Astronomie at Calar Alto Observatory of the Centro Astronómico Hispano-Alemán. The 1.52 m telescope is operated by the Observatorio Astronómico Nacional at Calar Alto Observatory of the Centro Astronómico Hispano-Alemán. This work was supported by the CICYT under contract ESP95-0180, and by the Ayudas para la utilización de recursos científicos de caracter específico by the DGICYT.

© European Southern Observatory (ESO) 1997

Online publication: May 26, 1998

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