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Astron. Astrophys. 332, 1142-1146 (1998)

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Acknowledgements

The authors would like to thank Profs. P.-Y. Zhang and B.-X. Xu for their valuable advice and suggestions. Also, we are grateful to Yokotsuka Hiroyuki for critical comments on earlier discussions and a referee for his detailed comments on the manuscript. We thank X. Xu for technical assistance and Dr. K.-J. Zhang for helping to improve the English expressions. This work was partially supported by the National Natural Science Foundation of China.

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© European Southern Observatory (ESO) 1998

Online publication: March 30, 1998
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