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Astron. Astrophys. 361, L49-L52 (2000) AcknowledgementsWe thank F. D'Antona for stimulating discussions and I. Baraffe for providing their evolutionary tracks. We acknowledge the use of the program for the light-curve synthesis of eclipsing binaries, Nightfall , written by Rainer Wichmann. This work has been financed by the Italian Ministero per la Ricerca Scientifica e Tecnologica ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 2000 Online publication: October 10, 2000 ![]() |