Astron. Astrophys. 326, 318-328 (1997)

Acknowledgements

We would like to thank the referee, Hans Olofsson, for very useful comments, and Mark Morris, Cecilia Barnbaum and Claudia Kahane for sending us papers in advance of publication. We thank the staff at CSO, especially Antony Schinkel, Maren Purves and Tom Phillips, for their help with the observations. Astronomical research at the CSO is supported by the National Science Foundation via grant AST93-13929. This research made use of the SIMBAD data base, operated at CDS, Strasbourg, France. Support for this work from Princeton University and Fonds National de la Recherce Scientific (Belgium) is gratefully acknowledged. AJ is Research Associate with F.N.R.S. (Belgium).

© European Southern Observatory (ESO) 1997

Online publication: April 20, 1998
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