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Astron. Astrophys. 335, 1070-1076 (1998) AcknowledgementsWe thank Dr. P. Gensheimer who assisted in the measurements at the 30 m telescope. We thank the referee, Dr. J. Crovisier, for valuable comments. This work was supported by a Bennigsen-Foerder Research Prize granted to M.H. by the Land Nordrhein Westfalen. R.M. was supported by a Heisenberg fellowship by the Deutsche Forschungsgemeinschaft. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: June 26, 1998 ![]() |