Hot Gas in the Circumstellar Bubble NGC 6888

Details Hot Gas in the Circumstellar Bubble NGC 6888 Hot Gas in the Circumstellar Bubble NGC 6888

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002cxo..prop.1150g&link_type=abstract

Chandra Proposal ID #04200952

Physics

Chandra Proposal Id #04200952

Scientific paper

Fast stellar winds from massive stars can blow bubbles in the ambient medium. Bubble interiors should be filled with shocked fast wind at X-ray-emitting temperatures. Diffuse X-rays have been unambiguously detected in NGC6888 and S308, two circumstellar bubbles around Wolf-Rayet stars. Both show X-ray luminosities 1--2 orders of magnitude lower than expected in adiabatic bubble models. To explain this discrepancy, a mass-loading bubble model has been proposed and appears to be able to explain the temperature and surface brightness profiles of S308 as derived from XMM data. We request a deep Chandra ACIS-S observation of the X-ray-bright northeast part of NGC6888 in order to assess the applicability of mass-loading bubble models and to quantify the physical process of cloud evaporation.

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