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Astron. Astrophys. 332, 127-134 (1998) AcknowledgementsI like to thank Josef Wagenhuber and Achim Weiss for their stellar evolution program, Johannes Reetz for his helpful tools and Thomas Gehren for all valuable discussions and improvements. Finally several suggestions of the referee J. Christensen-Dalsgaard are gratefully acknowledged. This research was supported by the Deutsche Forschungsgemeinschaft, DFG under grant Ge 490/12-1. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: March 10, 1998 ![]() |