Astron. Astrophys. 323, 442-448 (1997)

Acknowledgements

We are grateful to the staffs of UKIRT and IRTF for their support of these observations. Some of the data presented here were obtained with the UKIRT Service programme. UKIRT is operated by the Joint Astronomy Centre on behalf of the UK Particle Physics and Astronomy Research Council (PPARC). Some of the data reduction was undertaken on the Starlink Network, which is run by the Central Laboratory of the Research Councils (CLRC) on behalf of PPARC. One of us (VT) gratefully acknowledges RAL's financial support. We are grateful to the referee for helpful comments on the paper.

© European Southern Observatory (ESO) 1997

Online publication: June 5, 1998

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