3D-simulation of the Outer Convection-zone of an A-star

Abstract

The convection code of Nordlund & Stein has been used to evaluate the 3D, radiation-coupled convection in a stellar atmosphere with Teff=7300K, logg=4.3 and [Fe/H]=0.0, corresponding to a main-sequence A9-star. I will present preliminary comparisons between the 3D-simulation and a conventional 1D stellar structure calculation, and elaborate on the consequences of the differences.Comment: 6 pages, 2 figures to appear in "The A Star Puzzle", IAU Symp. 224, J. Zverko, W. W. Weiss, J. Ziznovsky & S. J. Adelman eds., Cambridge Univ. Pres