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Astron. Astrophys. 328, 565-570 (1997) AcknowledgementsThis work was supported by the Austrian Fond zur Förderung der wissenschaftlichen Forschung under project S7302-AST. The ROSAT project is supported by the German Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie (BMBF/DARA) and the Max-Planck-Gesellschaft. Thanks go to Jürgen Schmitt for several very useful discussions and to our referee Th. Preibisch for valuable comments on the manuscript. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1997 Online publication: March 26, 1998 ![]() |