X-RAYS FROM SUPERBUBBLES IN THE LARGE-MAGELLANIC-CLOUD - V - THE H-IICOMPLEX N-11

The giant H II complex N11 in the Large Magellanic Cloud contains OB a ssociations at several different stages in their life histories. We ha ve obtained ROSAT PSPC and HRI X-ray observations, Curtis Schmidt CCD images, echelle spectra in H alpha and [N II] lines, and IUE interstel lar absorption line observations of this region. The central bubble of N11 has an X-ray luminosity a factor of only 3-7 brighter than that p redicted for an energy-conserving superbubble, making this the first d etection of X-ray emission from a superbubble without a strong X-ray e xcess. The region N11B contains an extremely young OB association anal ogous to the central association of the Carina Nebula, apparently stil l embedded in its natal molecular cloud. We find that N11B emits diffu se X-ray emission, probably powered by stellar winds. Finally, we comp are the tight cluster HD 32228 in N11 to R136 in 30 Dor. The latter is a strong X-ray source, while the former is not detected, showing that strong X-ray emission from compact objects is not a universal propert y of such tight clusters.