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Astron. Astrophys. 364, 785-792 (2000) AcknowledgementsS.Q. Liu is supported in this work by the grants of the Nature Science Foundation of Jiangxi Province. X. Q. Li is supported in this work by the funds of the National Natural Science Foundation of China. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 2000 Online publication: January 29, 2001 ![]() |