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Astron. Astrophys. 351, 597-606 (1999) AcknowledgementsThe authors would like to express their sincere gratitude to Dr. B. Carney and Dr. A. Fry for their help with the high quality spectral material and useful discussions. Our special thanks to Dr. L.L. Kiss for fruitful discussions of the obtained results and to Dr. J. Vinkó for useful comments. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1999 Online publication: November 3, 1999 ![]() |