Upper boundary condition for asteroseismological modelling of solar-type stars

Abstract

We present a grid of line blanketed spherical LTE model atmospheres and high resolution extinction spectra for use in interpolating an accurate outer boundary condition for asteroseismology calculations at arbitrary T[subscript eff] and log g. We investigate the accuracy of four interpolation methods by interpolating within our grid to solar values of T[subscript eff] and log g and comparing the results to an exact solar model. We test the impact of the resolution of our grid on the accuracy of the interpolations by performing linear interpolations within our grid at different sampling rates in T[subscript eff] and log g. We test whether interpolating k[subscript R] within our grid and computing T[subcript R] or calculating T[subscript R] for each model and interpolating it directly produces more accurate results. We also present a NLTE exact solar model and compare the boundary condition resulting from it to those of the LTE exact model.