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Astron. Astrophys. 347, 370-374 (1999) AcknowledgementsThis work was supported by the TMR programme of the EU under contract FMRX-CT98-0168. Part of the work was carried out while LD was Dozor Visiting Fellow at the Ben-Gurion University of the Negev; the warm hospitality of Prof M Mond and the stimulating atmosphere of the BGU is gratefully acknowledged. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1999 Online publication: June 18, 1999 ![]() |