Astron. Astrophys. 358, 869-885 (2000)

Acknowledgements

We thank Johan Holmberg for kindly making his data on the scale heights available to us before publication, and Eric Bell for a critical reading of the manuscript, and for giving important suggestions with respect to the presentation of the paper. The referee, Dr. David Soderblom, has raised several points, which contributed to improve the paper. We have made extensive use of the SIMBAD database, operated at CDS, Strasbourg, France. This work was supported by FAPESP and CNPq to WJM and HJR-P, NASA Grant NAG 5-3107 to JMS, and the Finnish Academy to CF.

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Online publication: June 20, 2000
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