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Astron. Astrophys. 361, 795-802 (2000) AcknowledgementsWe wish to thank R. Prix and P. Hansel for very valuable discussions. One of us (D.S.) would like to acknowledge "Jumelage France-Arménie" exchange programme for financial support. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 2000 Online publication: October 2, 2000 ![]() |