Astron. Astrophys. 357, 587-596 (2000)

Acknowledgements

We would like to thank the referee M. Barstow whose comments helped improving this paper. This work has been supported by the Deutsches Zentrum für Luft- und Raumfahrt (DLR) under grant 50 OR 96173. We have made use of the Simbad data base, operated at CDS, Strasbourg, France.

© European Southern Observatory (ESO) 2000

Online publication: June 5, 2000
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