![]() | ![]() |
Astron. Astrophys. 322, 1-18 (1997) AcknowledgementsF.B. is grateful to IAP where most of this work has been conducted and to the Observatoire Midi-Pyrénées where it has been completed. The authors are also thankful to the Observatoire de Strasbourg for its very warm hospitality. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1997 Online publication: June 30, 1998 ![]() |