Excitation rates of p modes: mass luminosity relation across the HR diagram

Abstract

We compute the rates P at which energy is injected into the p modes for a set of 3D simulations of outer layers of stars. We found that Pmax - the maximum in P - scales as (L/M)^s where s is the slope of the power law, L and M are the luminosity and the mass of the 1D stellar models associated with the simulations. The slope is found to depend significantly on the adopted representation for the turbulent eddy-time correlation function, chi_k. According to the expected performances of COROT, it will likely be possible to measure Pmax as a function of L/M and to constrain the properties of stellar turbulence as the turbulent eddy time-correlation.

2 pages, 1 figure, proceedings of "SF2A-2004: Semaine de l'Astrophysique Francaise", meeting held in Paris, France, June 14-18, 2004, EdP-Sciences, Conference Series