Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010a%26a...516a..53a&link_type=abstract
Astronomy and Astrophysics, Volume 516, id.A53
Astronomy and Astrophysics
Astrophysics
7
Diffusion, Stars: Abundances, Stars: Chemically Peculiar, Stars: Magnetic Field
Scientific paper
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 Teff = 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.
Figures 9-28 are only available in electronic form at http://www.aanda.org
Alecian Georges
Stift Martin J.
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