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Calibrating linear damping rates with Kepler linewidths
Günter Houdek (Stellar Astrophysics Centre, Aarhus University)

Linear damping rates of radial oscillation modes in selected Kepler stars are estimated with the help of a nonadiabatic stability analysis. The convective fluxes are obtained from a nonlocal, time-dependent convection model. The mixing-length parameter is calibrated to the surface convection zone of a stellar model obtained from fitting adiabatic frequencies to the observations. The anisotropy parameter of the turbulent velocity field and the remaining nonlocal convection parameters are calibrated to 3D simulation results and to obtain a 'good' agreement with the Kepler linewidths measurements. Results for selected Kepler stars are presented.

Instituto de Astrofísica e Ciências do Espaço Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia