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- W2078315079 abstract "S308 is a circumstellar bubble blown by the WN4 star HD 50896. 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 an N-enriched plasma at temperatures of ~1.1 × 106 K. A hotter gas component may exist but its temperature is not well constrained since 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) × 1034 ergs s-1. 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 García-Segura & Mac Low, to demonstrate that the X-ray-emitting gas must be dominated by mixed-in nebular material." @default.
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- W2078315079 date "2003-12-20" @default.
- W2078315079 modified "2023-10-17" @default.
- W2078315079 title "Hot Gas in the Circumstellar Bubble S308" @default.
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- W2078315079 doi "https://doi.org/10.1086/379607" @default.
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