![]() | ![]() |
Astron. Astrophys. 355, 365-374 (2000) AcknowledgementsWe thank the anonymous referee whose comments have stimulated a substantial improvement of this manuscript. This work was partially supported by a grant of Alcatel Space Industries and the "Conseil Régional PACA". ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 2000 Online publication: March 17, 2000 ![]() |