Astron. Astrophys. 350, 566-570 (1999)

Acknowledgements

We would like to thank Dr Petr Harmanec for helpful suggestions and stimulating discussions. Ms. D. Pla ko, Dr. K. Pavlovski and Mr. D. ikoti obtained some of the UBV observations at Hvar. We are grateful to Dr. D. Holmgren for valuable comments. Our special thanks belong to the referee, Dr. C. Sterken for constructive and very helpful criticism. This study was finished during the visit of H.B. to the Ond ejov Observatory. He wants to acknowledge the hospitality of the colleagues at the Stellar Department there. The use of the Strasbourg CDS bibliography is also gratefully acknowledged.

© European Southern Observatory (ESO) 1999

Online publication: October 4, 1999
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