Seismic diagnostics inferred from the amplitudes of stochastically-excited modes

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Scientific paper

Solar-like oscillations have been detected in numerous main-sequence stars as well as in red giant stars. The excitation of such oscillations is ensured by turbulent convection at the upper most part of the convective zones. From the measurement of the mode amplitude and line-width it is possible to infer the power supplied to the modes by turbulent convection. Apart from the Sun, α Cen A is the only star for which both mode amplitudes and mode line-widths have been derived. I will first present the diagnostics inferred from the measurement of the amplitudes and line-widths in the Sun and in α Cen A. For other stars, despite the lack of direct constraints on the excitation mechanisms, I will show that the solar-like oscillations observed in different stars can nevertheless offer interesting constraints on the properties of turbulent convection.

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