Astron. Astrophys. 341, 553-559 (1999)

Acknowledgements

We would like to thank V.P. Grinin for helpful discussion. We are also grateful to the referee, Gösta Gahm, for many suggestions to improve the paper. This research was partly supported by the EC Human Capital and Mobility (Networks) grant "Late type stars: activity, magnetism, turbulence" No. ER-BCHRXCT940483.

© European Southern Observatory (ESO) 1999

Online publication: December 4, 1998
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