Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ap%26ss.335...77r&link_type=abstract
Astrophysics and Space Science, Vol. 335, No. 1, p. 77-82
Astronomy and Astrophysics
Astrophysics
Chemically Peculiar Stars, Stellar Atmosphere Models, Diffusion, Element Stratification, Uv Lines
Scientific paper
In quiet stellar atmospheres that are stabilized, for example, by the presence of strong magnetic fields, a non-uniform distribution of chemical elements (abundance stratification) is predicted by the diffusion theory. Spectroscopic observations of magnetic Ap stars provide a strong support for the diffusion theory. Stratification predictions in the upper atmosphere, in particular, strongly depend on the magnetic field geometry. Optical lines used in stratification analysis of Ap stars do not probe the upper atmospheric layers and, hence, cannot provide reliable information on abundance gradients there. We show the expected effect of stratification on the profiles of strong lines in the UV region and how these lines may be used for constraining diffusion theory.
LeBlanc Francis
Ryabchikova Tanya
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