Astron. Astrophys. 364, 793-798 (2000)

Acknowledgements

We thank Debang Lao and Guo Yang for data processing; we also thank Dr. Yuying Liu, Huirong Ji, Leping Zheng, Congling Cheng, Zhijun Cheng, Wujing Lu and other staff of the BAO for operating the spectrometers properly. This work is supported by National Nature Science Foundation Projects 19773016, 19833050 and 19973008. We also acknowledge the referee, Dr. C.E. Alissandrakis for helpful comments to improve this paper.

© European Southern Observatory (ESO) 2000

Online publication: January 29, 2001
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