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Astron. Astrophys. 354, 610-620 (2000) AcknowledgementsWe deeply thank the referee (Dr. Bersier) for several valuable comments which improved the first version of the paper. Financial support for this work was provided by the Ministero dell'Università e della Ricerca Scientifica e Tecnologica (MURST) under the scientific project "Stellar Evolution" (Vittorio Castellani, coordinator). ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 2000 Online publication: February 9, 2000 ![]() |