The NLTE Formation of Iron Lines Used in Solar Polarimetry |
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| Authors: | Shchukina Nataliya G Bueno Javier Trujillo Kostik Roman I |
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| Institution: | (1) Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain;(2) Main Astronomical Observatory, National Academy of Sciences, 252650 Kyiv-22, Ukraine |
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| Abstract: | We study in some detail one-dimensional NLTE effects in solar Fei lines. The lines selected are frequently used in solar polarimetry, and also in studies of line asymmetries and for abundance determinations. Our model atom for Fei–Feii–Feiii is realistic: it takes account of multiplet structure and it includes over 200 bound–bound and bound–free transitions in detail. We use very efficient iterative methods for the self-consistent solution of the kinetic and radiative transfer equations (Auer, Fabiani Bendicho, and Trujillo Bueno, 1994). We have applied these fast methods of solution because they are suitable for the investigation of 2D and 3D NLTE transfer effects with multilevel atoms, which constitutes the next step of our ongoing research project on the iron line formation problem. |
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