Based on observations collected at the
Observatoire de Haute-Provence
(CNRS), France, and Hubble Space Telescope (HST) data obtained from the
Space Telescope European Coordinating Facility (ST-ECF) archive. Tables 5
and 6 are 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/Abastract.html.