Astron. Astrophys. 354, 621-635 (2000)

Acknowledgements

We would like to thank the referee, Dr. Ralph Neuhäuser, for his helpful comments that improved the content of the paper. VMC wishes to thank the staff of Dunsink Observatory for his stay there while gaining experience in ROSAT data analysis and also acknowledges the grant PRODEP/96 - Acção 5.2 Medida 5. This work was partially supported by the Portuguese Fundação para a Ciência e Tecnologia through grants PESO/P/PRO/1196/97 and PESO/P/INF/1197/97. LN was supported by a TMR Fellowship.

© European Southern Observatory (ESO) 2000

Online publication: February 9, 2000
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