Abstract
We present a detailed analysis of deep ROSAT HRI observations of the luminous blue variable P Cyg and its surrounding radio nebula. The HRI image provides a point source at the position of P Cyg. However, we show that this emission can be attributed to the ultraviolet leak of the ROSAT HRI. The X-ray flux upper limit derived from the HRI data of this star is discussed in the context of X-ray emission from hot stars. Furthermore, we present a search for diffuse X-ray emission possibly associated with the radio nebula surrounding P Cyg. We compare our results to model predictions and X-ray fluxes observed for shells around other hot stars. Additionally, we detect 10 X-ray sources in the field of view. All but one of these X-ray emitters have stellar counter parts in the Palomar Sky Survey. We suggest that they are active late-type stars possibly belonging to Cyg OB1.
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