UV line profiles as a probe for atomic diffusion theory in stellar atmospheres |
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| Authors: | T Ryabchikova F LeBlanc |
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| Institution: | 1.Institute of Astronomy RAS,Moscow,Russia;2.Département de Physique et d’Astronomie,Université de Moncton,Moncton,Canada |
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| Abstract: | 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. |
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