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Astron. Astrophys. 359, 113-130 (2000) AcknowledgementsWe thank Francesco Palla for fruitful discussions during the 5th
French-Italian meeting in the island of Ponza, and the referee Fred
Walter for his useful remarks. NG is supported by the European Union
(Marie Curie Individual grant; HPMF-CT-1999-00228). EDF is partially
supported by NASA contract NAS8-38252. We used SIMBAD maintained by
the CDS (Strasbourg Observatory, France). We also used photographic
data obtained using The UK Schmidt Telescope: original plate material
is copyright
© European Southern Observatory (ESO) 2000 Online publication: June 30, 2000 ![]() |