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Astron. Astrophys. 329, 895-905 (1998) AcknowledgementsDM thanks the Dept of Geosciences and Astronomy, University of Oulu, for its hospitality. The work was partially supported by SERC/PPARC Grant GR/J60278, by ECHCM contract ERBCHRXCT940483, and by NATO Grant CRG1530959. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: December 16, 1997 ![]() |