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Astron. Astrophys. 320, 525-539 (1997)

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Acknowledgements

I want to thank Jürgen Schmitt for helpful discussions and the referee for his comments, which helped to improve this paper. This work was supported by DARA under grant 05 OR 9103 0. The ROSAT project was supported by the Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie (BMBF/DARA) and the Max-Planck-Society. This research has made use of NASA's Astrophysics Data System and the SIMBAD data base.

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© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998
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