Astron. Astrophys. 348, 364-370 (1999)

Acknowledgements

Thanks to an anonymous referee for contributing to improve a first version of this paper. This work was partly supported by Fondecyt 1971064 and DI UdeC 97.11.20-1. Support for this work was also provided by the National Science Foundation through grant number GF-1002-98 from the Association of Universities for Research in Astronomy, Inc., under NSF Cooperative Agreement No. AST-8947990. R.M. thanks Dr. Dimitar Sasselov for his kind hospitality during his stay at the Harvard-Smithsonian Center for Astrophysics.

© European Southern Observatory (ESO) 1999

Online publication: July 26, 1999
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