Calibrating damping rates with LEGACY
Abstract
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 depth of a stellar model obtained from fitting adiabatic frequencies to the LEGACY* observations, and two of the three nonlocal convection parameters are calibrated to the corresponding LEGACY* linewidth measurements. The atmospheric structure in the 1D stability analysis adopts a temperature-optical-depth relation derived from 3D hydrodynamical simulations. Results from 3D simulations are also used to calibrate the turbulent pressure and to guide the functional form of the depth-dependence of the anisotropy of the turbulent velocity field in the 1D stability computations.
- Publication:
-
European Physical Journal Web of Conferences
- Pub Date:
- October 2017
- DOI:
- 10.1051/epjconf/201716002003
- arXiv:
- arXiv:1702.04251
- Bibcode:
- 2017EPJWC.16002003H
- Keywords:
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- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 4 pages, 4 figures, refereed conference proceedings, "Seismology of the Sun and the Distant Stars 2016", M\'ario J.P.F.G. Monteiro, Margarida S. Cunha, Jo\~ao M.T. Ferreira (eds), EPJ Web of Conferences