Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...313..624h&link_type=abstract
Astronomy and Astrophysics, v.313, p.624-632
Astronomy and Astrophysics
Astrophysics
9
Diffusion, Stars: Abundance, Stars: Chemically Peculiar
Scientific paper
We study the abundance anomalies of aluminium in early-type main-sequence peculiar stars within the framework of the diffusion model. Radiative accelerations on aluminium are computed for atmosphere models of effective temperatures between 10000 and 15000K. The possible presence of a magnetic field is considered. We use the theoretical atomic data provided by the Opacity Project for all these calculations. For stars with Teff cooler than 13000K and for solar concentration, the radiative accelerations are found to be smaller than gravity in the major part of the line forming region, which is consistent with the observed underabundances. The situation seems less clear for hotter stars for which the accelerations are slightly higher making difficult to do any firm conclusion without detailed time-dependent diffusion calculations. However, since aluminium is not supported by the radiation field in the deeper layers (τ_5000_>=10^2^), we predict that in all cases, the total amount of aluminium in the atmosphere should be decreasing as the star evolves on the main-sequence.
Alecian Georges
Artru Marie-Christine
Hui-Bon-Hoa Alain
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