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arXiv 1306.3262astro-ph.SR
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大质量恒星内部重力波:Angular Momentum输运

Internal Gravity Waves in Massive Stars: Angular Momentum Transport

T. M. Rogers, D. N. C. Lin, J. N. McElwaine, H. H. B. Lau

摘要:

本文对具有对流核和扩展辐射包层的恒星内部重力波进行了数值模拟。我们报告的振幅,频谱,耗散和随之而来的角动量输运这样的波。我们发现,这些波是有效地产生和运输角动量在短时间尺度上大的距离。我们表明,在地球的大气中,IGW驱动赤道流的变化幅度和方向在短时间尺度上。这些结果对大质量恒星的观测推断以及它们的长期角动量演化具有深远的影响。我们认为IGW角动量输运可以解释许多观测之谜,如:热恒星周围的热彗星的错位,Be类恒星,Ni富集异常的大质量恒星和非同步轨道的相互作用的双星。

英文摘要:

We present numerical simulations of internal gravity waves (IGW) in a star with a convective core and extended radiative envelope. We report on amplitudes, spectra, dissipation and consequent angular momentum transport by such waves. We find that these waves are generated efficiently and transport angular momentum on short timescales over large distances. We show that, as in the Earth's atmosphere, IGW drive equatorial flows which change magnitude and direction on short timescales. These results have profound consequences for the observational inferences of massive stars, as well as their long term angular momentum evolution. We suggest IGW angular momentum transport may explain many observational mysteries, such as: the misalignment of hot Jupiters around hot stars, the Be class of stars, Ni enrichment anomalies in massive stars and the non-synchronous orbits of interacting binaries.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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