| Autor: |
Adrian T. Potter, Herbert H. B. Lau, Christopher A. Tout |
| Rok vydání: |
2011 |
| Předmět: |
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| Zdroj: |
Monthly Notices of the Royal Astronomical Society. 415:959-963 |
| ISSN: |
0035-8711 |
| Popis: |
Models of rapidly rotating massive stars at low metallicities show significantly different evolution and higher metal yields compared to non-rotating stars. We estimate the spin-down time-scale of rapid rotating non-convective stars supporting an alpha-Omega dynamo. The magnetic dynamo gives rise to mass loss in a magnetically controlled stellar wind and hence stellar spin down owing to loss of angular momentum. The dynamo is maintained by strong horizontal rotation-driven turbulence which dominates over the Parker instability. We calculate the spin-down time-scale and find that it could be relatively short, a small fraction of the main-sequence lifetime. The spin-down time-scale decreases dramatically for higher surface rotations suggesting that rapid rotators may only exhibit such high surface velocities for a short time, only a small fraction of their main-sequence lifetime. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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