Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-09-05
Astrophys.J.599:1189-1195,2003
Astronomy and Astrophysics
Astrophysics
18 pages, 3 figures, to appear in the Astrophysical Journal, Dec 20 issue
Scientific paper
10.1086/379607
S308 is a circumstellar bubble blown by the WN4 star HD50896. It is one of the only two single-star bubbles that show detectable diffuse X-ray emission. We have obtained XMM-Newton EPIC observations of the northwest quadrant of S308. The diffuse X-ray emission shows a limb-brightened morphology, with a clear gap extending from the outer edge of the diffuse X-ray emission to the outer rim of the nebular shell. The X-ray spectrum of the diffuse emission is very soft, and is well fitted by an optically thin plasma model for a N-enriched plasma at temperatures of ~1.1x10^6 K. A hotter gas component may exist but its temperature is not well constrained as it contributes less than 6% of the observed X-ray flux. The total X-ray luminosity of S308, extrapolated from the bright northwest quadrant, is <=(1.2+-0.5)x10^{34} ergs/s. We have used the observed bubble dynamics and the physical parameters of the hot interior gas of S308 in conjunction with the circumstellar bubble model of Garcia-Segura & Mac Low (1995) to demonstrate that the X-ray-emitting gas must be dominated by mixed-in nebular material.
Chu Y.-H. Y.-H.
Garcia-Segura Guillermo
Gruendl Robert A.
Guerrero Martin A.
Wendker Heinrich J.
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