Calibrating damping rates with LEGACY linewidths

Research output: Research - peer-reviewJournal article

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.
Original languageEnglish
Article number02003
JournalE P J Web of Conferences
Volume160
Number of pages4
ISSN2100-014X
DOIs
StatePublished - Oct 2017

    Research areas

  • Astrophysics - Solar and Stellar Astrophysics

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