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Astron. Astrophys. 336, 769-775 (1998) AcknowledgementsWe acknowledge a travel support to Calar Alto by the Deutsche Forschungsgemeinschaft. We thank K. Birkle for providing the Schmidt plate images as well as F.-L. Deubner, J. Isserstedt, and H.W. Yorke for helpful discussions. Additionally we appreciate encouraging comments of the referee D.J. Thomson. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: July 20, 1998 ![]() |