Astron. Astrophys. 332, 629-642 (1998)

Acknowledgements

This work was partially supported by the Spanish Ministerio de Educación y Ciencia, Grants number PB 91/0007, PB94/0165, PB95/0066 and by the DGAPA-UNAM project IN101794. L.F.M. acknowledges the hospitality of Jorge Cantó when visiting the Instituto de Astronomía, UNAM. We thank H.Frahm and F.Hoyo for their help during the observations, Fr. M.Weckauf for her help in preparing Fig. 3 and Alison Rushworth for a careful reading that improved the clarity of the manuscript. This research has made use of the Simbad database, operated at CDS, Strasbourg, France, and of the computer based catalogue of UBVRI photoelectric photometry of T Tauri stars of Herbst et al. (1994).

© European Southern Observatory (ESO) 1998

Online publication: March 23, 1998
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