Oscillation power spectra of the Sun and of Alpha Cen A: observations versus models

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dc.creatorSamadi, R.
dc.creatorGoupil, M. J.
dc.creatorBaudin, F.
dc.creatorGeorgobiani, D.
dc.creatorTrampedach, R.
dc.creatorStein, R.
dc.creatorNordlund, A.
dc.date2004-09-14
dc.date.accessioned2026-07-07T02:14:36Z
dc.date.available2026-07-07T02:14:36Z
dc.descriptionHydrodynamical, 3D simulations of the outer layers of the Sun and Alpha Cen A are used to obtain constraints on the properties of turbulent convection in such stars. These constraints enable us to compute - on the base of a theoretical model of stochastic excitation - the rate P at which p modes are excited by turbulent convection in those two stars. Results are then compared with solar seismic observations and recent observations of Alpha Cen A. For the Sun, a good agreement between observations and computed P is obtained. For Alpha Cen A a large discrepancy is obtained which origin cannot be yet identified: it can either be caused by the present data quality which is not sufficient for our purpose or by the way the intrinsic amplitudes and the life-times of the modes are determined or finally attributed to our present modelling. Nevertheless, data with higher quality or/and more adapted data reductions will likely provide constraints on the p-mode excitation mechanism in Alpha Cen A.
dc.description4 pages, 4 figures, proceedings of the SOHO14/GONG 2004 Workshop "Helio- and Asteroseismology: Towards a Golden Future" from July 12-16 2004 at New Haven CT (USA)
dc.identifierhttps://arxiv.org/abs/astro-ph/0409325
dc.identifierhttp://arxiv.org/abs/astro-ph/0409325
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/8174
dc.subjectAstrophysics
dc.titleOscillation power spectra of the Sun and of Alpha Cen A: observations versus models
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