Based on observations obtained at the European Southern Observatory, Paranal, Chile (ESO programmes 66.B-0127(A) and 70.A-0651(A) and on observations obtained with XMM-Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA.

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Appendices A-D are only available in electronic form at http://www.aanda.org

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Table 8 is also 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/466/41

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