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Astron. Astrophys. 317, 761-768 (1997) AcknowledgementsWe thank X. Luri, J. Torra, F. Figueras and D. Barthès for fruitful discussions and for providing some of their results, and B. Plez for giving a spectrum of Vega. We are also grateful to B. Gustafsson for useful comments as a referee. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1997 Online publication: July 8, 1998 ![]() |