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Astron. Astrophys. 324, 155-160 (1997) AcknowledgementsWe want to thank Gösta Gahm for valuable comments and Karl-Heinz Mantel for assisting us with the reductions of the optical data. E.G. wishes to thank the Swedish National Space Board for financial support. The ROSAT project has been supported by the Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie (BMBF) and the Max-Planck-Gesellschaft (MPG). ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1997 Online publication: May 26, 1998 ![]() |