Based on observations carried out at the European Southern Observatory in La Silla (Chile) (ESO 69.B-0706 and 70.B-0338), with the Multiple Mirror Telescope which is a joint facility of the Smithsonian Institution and the University of Arizona, and with the Italian Telescopio Nazionale Galileo (AOT-5, 3-18) at the Observatorio del Roque de los Muchachos in La Palma (Spain).

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Table 1 is only available in electronic form at http://www.edpsciences.org. Table 5 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/416/507

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... ESO-MIDAS

MIDAS is developed and maintained by the European Southern Observatory.

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... IRAF

IRAF is distributed by NOAO, which is operated by AURA Inc., under contract with the National Science Foundation.

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