3-D hydrodynamic simulations of convection in A stars

Details 3-D hydrodynamic simulations of convection in A stars 3-D hydrodynamic simulations of convection in A stars

2006-10-04

arxiv.org/abs/astro-ph/0610111v1

Astronomy and Astrophysics

Astrophysics

3 pages, 2 figures; to appear in the proceedings of the IAU Symposium 239, Convection in Astrophysics

Scientific paper

Broadening and asymmetry of spectral lines in slowly rotating late A-type stars provide evidence for high-amplitude convective motions. The properties of turbulence observed in the A-star atmospheres are not understood theoretically and contradict results of previous numerical simulations of convection. Here we describe an ongoing effort to understand the puzzling convection signatures of A stars with the help of 3-D hydrodynamic simulations. Our approach combines realistic spectrum synthesis and non-grey hydrodynamic models computed with the CO5BOLD code. We discuss these theoretical predictions and confront them with high-resolution spectra of A stars. Our models have, for the first time, succeeded in reproducing the observed profiles of weak spectral lines without introducing fudge broadening parameters.

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