X-ray emission from wind blown interstellar bubbles I. ROSAT observations of NGC 6888

Details X-ray emission from wind blown interstellar bubbles I. ROSAT observations of NGC 6888 X-ray emission from wind blown interstellar bubbles I. ROSAT observations of NGC 6888

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...286..219w&link_type=abstract

Astronomy and Astrophysics 286, 219-230 (1994)

Astronomy and Astrophysics

Astrophysics

50

Stars: Wolf-Rayet Stars, Ism: Bubbles, Ism: Ngc 6888, X-Rays: Ism

Scientific paper

The interaction of fast stellar winds with the surrounding interstellar medium produces large amounts of hot X-ray emitting gas. Scarce previous observations indicated substantial differences between simple one-dimensional models and the data. We have obtained ROSAT images of several wind blown interstellar bubbles. In this first paper we present an X-ray map of the prototype ring nebula NGC 6888. Although we confirm previous total flux determinations and the possibility to reconcile these values with theory by introducing ionization non-equilibrium, our map demonstrates that the assumed geometry (a thick shell) is far from reality. The X-ray emission is outlined by the brightest optical parts of the nebula and is concentrated in a few filament type structures which cannot fill much more than about 1% of the volume of the bubble. The scale lengths of these structures is from 1.5 pc down to our resolution limit <~0.5 pc. A solution of these discrepancies is not yet at hand. A few point sources in the image including the central Wolf-Rayet star HD 192163 are briefly discussed.

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