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Astron. Astrophys. 332, 575-585 (1998) AcknowledgementsIt is a pleasure to acknowledge useful discussions with N.V. Kharchenko. We appreciate the usefull comments of the referee John R. Stauffer. This research was partly supported by the Deutsche Forschungsgemeinschaft.
© European Southern Observatory (ESO) 1998 Online publication: March 23, 1998 ![]() |