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Robert Stein Dali Georgobiani Regner Trampedach Hans-Günter Ludwig Åke Nordlund 《Solar physics》2004,220(2):229-242
P-mode oscillations in the Sun and stars are excited stochastically by Reynolds stress and entropy fluctuations produced by
convection in their outer envelopes. The excitation rate of radial oscillations of stars near the main sequence from K to
F and a subgiant K IV star have been calculated from numerical simulations of their surface convection zones. P-mode excitation
increases with increasing effective temperature (until envelope convection ceases in the F stars) and also increases with
decreasing gravity. The frequency of the maximum excitation decreases with decreasing surface gravity. 相似文献
2.
R. Samadi M. -J. Goupil E. Alecian F. Baudin D. Georgobiani R. Trampedach R. Stein å. Nordlund 《Journal of Astrophysics and Astronomy》2005,26(2-3):171-184
The amplitude of solar-like oscillations results from a balance between excitation and damping. As in the sun, the excitation
is attributed to turbulent motions that stochastically excite thep modes in the uppermost part of the convective zone. We present here a model for the excitation mechanism. Comparisons between
modeled amplitudes and helio and stellar seismic constraints are presented and the discrepancies discussed. Finally the possibility
and the interest of detecting such stochastically excited modes in pre-main sequence stars are also discussed. 相似文献
3.
R. Trampedach 《Astrophysics and Space Science》2010,328(1-2):213-219
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