Astron. Astrophys. 323, 231-234 (1997)

Acknowledgements

We are grateful to Ken Libbrecht and Martin Woodard for providing us their fine data over the years and to Yvonne Elsworth for her constructive remarks that helped us to improve the paper. This work was supported by AFOSR-95-0070, NSF-AST-93-14820, NSF-INT-93-14820, and by KBN-2P304-013-07.

© European Southern Observatory (ESO) 1997

Online publication: June 5, 1998

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