Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...341l..31b&link_type=abstract
Astronomy and Astrophysics, v.341, p.L31-L34 (1999)
Astronomy and Astrophysics
Astrophysics
19
Atomic Data, Line: Formation, Sun: Faculae, Plages, Sun: Granulation, Polarization, Radiative Transfer
Scientific paper
In an attempt to assess the physical realism of the plage flux tube model derived by Bellot Rubio, Ruiz Cobo & Collados (\cite{brc}, \cite{bellot}) we extend its predictions to the Stokes V zero-crossing shifts of a number of Fe ii lines. For this analysis, accurate Fe ii central wavelengths are required. We have devised a procedure for bringing the available Fe ii laboratory wavelengths to the system of accurate Fe i wavelengths of Nave et al. (\cite{nav}). It is shown that, relative to this system, the Fe ii system of Kurucz (\cite{kur}) is shifted by 6.4 m Angstroms/ towards longer wavelengths. Some lines, however, are displaced by more than 10 m Angstroms/. Corrected central wavelengths have been used to extract the observed Stokes V zero-crossing shifts of 16 Fe ii lines. Comparison with the values resulting from the model of Bellot Rubio et al. (\cite{brc}, \cite{bellot}) suggests that the velocity gradients derived by these authors are esentially correct.
Bellot Rubio Luis Ramon
Collados Manuel
Ruiz Cobo Basilio
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