Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-09-15
Proc. 13th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, F. Favata, G.A.J. Hussain, B. Battrick eds., ESA Pub
Astronomy and Astrophysics
Astrophysics
5 pages, 6 figures (17 figure files), 1 Table
Scientific paper
We present first realistic numerical simulations of 3D radiative convection in the surface layers of main sequence A-type stars with Teff = 8000 K and 8500 K, log g = 4.4 and 4.0, recently performed with the CO5BOLD radiation hydrodynamics code. The resulting models are used to investigate the structure of the H+HeI and the HeII convection zones in comparison with the predictions of local and non-local convection theories, and to determine the amount of "overshoot" into the stable layers below the HeII convection zone. The simulations also predict how the topology of the photospheric granulation pattern changes from solar to A-type star convection. The influence of the photospheric temperature fluctuations and velocity fields on the shape of spectral lines is demonstrated by computing synthetic line profiles and line bisectors for some representative examples, allowing us to confront the 3D model results with observations.
Freytag Bernd
Ludwig Hans Günter
Steffen Matthias
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