Two-dimensional simulations of internal gravity waves in the radiation zones of intermediate-mass stars
Two-dimensional simulations of internal gravity waves in the radiation zones of intermediate-mass stars
复制标题
中等质量恒星辐射区内部重力波的二维模拟
DOI:
10.1093/mnras/staa2296
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发表时间:
2020
影响因子:
4.8
通讯作者:
Ratnasingam R
中科院分区:
文献类型:
--
作者:
Ratnasingam R
Intermediate-mass main-sequence stars have large radiative envelopes overlying convective cores. This configuration allows internal gravity waves (IGWs) generated at the convective–radiative interface to propagate towards the stellar surface. The signatures of these waves can be observed in the photometric and spectroscopic data from stars. We have studied the propagation of these IGWs using two-dimensional (2D) fully non-linear hydrodynamical simulations with realistic stellar reference states from the 1D stellar evolution code, Modules for Stellar Astrophysics (mesa). When a single wave is forced, we observe wave self-interaction. When two waves are forced, we observe non-linear interaction (i.e. triadic interaction) between these waves forming waves at different wavelengths and frequencies. When a spectrum of waves similar to that found in numerical simulations is forced, we find that the surface IGW frequency slope is consistent with recent observations. This power law is similar to that predicted by linear theory for the wave propagation, with small deviations that can be an effect of non-linearities. When the same generation spectrum is applied to 3 M⊙models at different stellar rotation and ages, the surface IGW spectrum slope is very similar to the generation spectrum slope.
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DOI:
--
发表时间:
1981
期刊:
影响因子:
--
作者:
W. Press
通讯作者:
W. Press
DOI:
10.1111/j.1365-2966.2010.16400.x
发表时间:
2010
影响因子:
4.8
作者:
Barker A
通讯作者:
Barker A
影响因子:
4.9
作者:
GOLDREICH, P;KUMAR, P
通讯作者:
KUMAR, P
影响因子:
7.9
作者:
Aerts, C.;Rogers, T. M.
通讯作者:
Rogers, T. M.
影响因子:
14.1
作者:
Bowman, Dominic M.;Burssens, Siemen;De Cat, Peter
通讯作者:
De Cat, Peter