X-ray emission from the wolf-rayet bubble s 308
The Wolf-Rayet (WR) bubble S308 around the WR star HD50896 is one of the only two WR bubbles known to possess X-ray emission. We present XMM-Newton observations of three fields of this WR bubble that, in conjunction with an existing observation of its northwest quadrant, map most of the nebula. The...
| Autores: | , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2012 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/414345 |
| Acceso en línea: | http://hdl.handle.net/10261/414345 |
| Access Level: | acceso abierto |
| Palabra clave: | ISM: bubbles ISM: individual objects (S 308) Stars: individual (HD 50896) Stars: winds, outflows Stars: Wolf–Rayet X-rays: individual (S 308) |
| Sumario: | The Wolf-Rayet (WR) bubble S308 around the WR star HD50896 is one of the only two WR bubbles known to possess X-ray emission. We present XMM-Newton observations of three fields of this WR bubble that, in conjunction with an existing observation of its northwest quadrant, map most of the nebula. The X-ray emission from S308 displays a limb-brightened morphology, with a central cavity 22′ in size and a shell thickness of 8′. This X-ray shell is confined by the optical shell of ionized material. The spectrum is dominated by the He-like triplets of N VI at 0.43keV and O VII at 0.57keV, and declines toward high energies, with a faint tail up to 1keV. This spectrum can be described by a two-temperature optically thin plasma emission model (T 1 1.1 × 106K, T 2 13 × 10 6K), with a total X-ray luminosity 2 × 1033ergs -1 at the assumed distance of 1.5kpc. © 2012 The American Astronomical Society. All rights reserved. |
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