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Astron. Astrophys. 350, 587-597 (1999)
Acknowledgements
JF is supported by JNICT (BPD/9919/96). This work was partially
supported by the France-Portugal co-operation (project 059-B0). We
gratefully thank Pierre Morel for his help with CESAM, and H.-G.
Ludwig for having made available results prior to publication. MNP is
grateful to R. Canavaggia ![[FORMULA]](img133.gif)
for her
help in the selection of target stars of the Hipparcos proposal
132.
© European Southern Observatory (ESO) 1999
Online publication: October 4, 1999
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