Astron. Astrophys. 331, 838-852 (1998)

Acknowledgements

This work was supported by the National Research Fund of the Bulgarian Ministry of Education, Science and Technologies (contract F469/1994). We thank an anonymous referee for useful and valuable remarks and suggestions, especially for inducing us to search for declination selection as well as for the difference between our results and those of Bahcall & Burgett (1986).

© European Southern Observatory (ESO) 1998

Online publication: March 3, 1998
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