Volume 516, June-July 2010
|Number of page(s)||17|
|Published online||24 June 2010|
Bi-dimensional element stratifications computed for magnetic Ap star atmospheres*
LUTH, Observatoire de Paris, CNRS, Université Paris Diderot,
5 Place Jules Janssen, 92190 Meudon, France e-mail: firstname.lastname@example.org
2 Institut für Astronomie (IfA), Universität Wien, Türkenschanzstrasse 17, 1180 Wien, Austria
Accepted: 2 March 2010
Context. Theoretical modelling of abundance stratifications and surface distributions of chemical elements in Ap stars constitutes a major challenge. The atomic diffusion model provides the most appropriate framework in which to understand these abundance anomalies.
Aims. We present theoretical 2D stratifications of 16 metals in upper main sequence chemically peculiar stars, with and without magnetic fields to provide a reference point for further theoretical and observational studies.
Methods. We used our code CaratStrat to compute a large grid of stratifications (equilibrium solutions in LTE) for plane-parallel = 8500, 10 000, 12 000, and 14 000 K stellar atmospheres. By interpolation, we constructed bi-dimensional cuts through these stellar atmospheres, which are permeated by a dipolar magnetic field of strength 20 kG at the magnetic pole. We also provide vertical (1D) stratifications of metals in non-magnetic stars (HgMn).
Results. We present a large number of 2D and 1D stratifications, mostly as online material. We discuss in detail the case of Fe for the Teff = 8500 K model in the printed version, and compare it with stratifications derived from observed spectra.
Key words: diffusion / stars: abundances / stars: chemically peculiar / stars: magnetic field
Figures 9–28 are only available in electronic form at http://www.aanda.org
© ESO, 2010
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