The Evolution of Circumstellar Medium around Rotating Massive Stars
A rotating 12 M star, after its main-sequence evolution, becomes a redsupergiant when it starts core Heburning. During core helium burning, as consequence of a variation of the hydrogen shell burning eciency,the star undergoes a so called \blue loop", i.e. it evolves into a blue supergiant stag...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2007 |
| País: | México |
| Institución: | Universidad Nacional Autónoma de México |
| Repositorio: | Redalyc-UNAM |
| OAI Identifier: | oai:redalyc.org:57130014 |
| Acceso en línea: | https://www.redalyc.org/articulo.oa?id=57130014 |
| Access Level: | acceso abierto |
| Palabra clave: | Física, Astronomía y Matemáticas OUTFLOWS ISM: BUBBLES STARS: WINDS HYDRODYNAMICS STARS: SUPERGIANTS |
| Sumario: | A rotating 12 M star, after its main-sequence evolution, becomes a redsupergiant when it starts core Heburning. During core helium burning, as consequence of a variation of the hydrogen shell burning eciency,the star undergoes a so called \blue loop", i.e. it evolves into a blue supergiant stage, where it nishes corehelium burning and becomes a redsupergiant again, before exploding as a supernova. We try to explain thestructures in Sher 25 and in SN 1987A through wind asymmetry caused by rotation. We use a stellar evolutionmodel to provide us with the time dependent stellar wind parameters such as wind velocity and mass-loss rate.These parameters serve as an input for hydrodynamical simulation of the circumstellar medium. The blueloop causes a very aspherical structure due to rotation, while the main sequence and redsupergiant phases arebasically spherical. We can conclude that the asymmetry of Sher 25 can be explained through stellar rotation |
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