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Astron. Astrophys. 335, 12-18 (1998) AcknowledgementsI am grateful to Marek Abramowicz, Stuart Bowyer, Walter Dehnen, Piero Madau, Ron Reynolds and Ewa Szuszkiewicz for their crucial help,and to the referee Don York for his valuable criticisms. This work has been supported by the Ministry of Universities and Scientific and Technological Research. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: June 12, 1998 ![]() |