The abundance of iron in the sun derived from photospheric Fe II lines

Astronomy and Astrophysics – Astrophysics

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Abundance, Iron, Line Spectra, Photosphere, Solar Granulation, Solar Spectra, Atmospheric Models, Hollow Cathodes, Meteoritic Composition, Silicon

Scientific paper

The solar abundance of iron is determined from photospheric Fe II lines whose f-values have been measured recently in a hollow-cathode experiment. In contrast to lines of Fe I these lines are perfectly in LTE in the sun, and the derived abundance is insensitive to imperfect modeling of the solar photosphere. The resulting iron abundance, log N (Fe) = 7.48 + or - 0.09 on the scale log N (H) = 12, is significantly lower than the currently accepted value based on lines of Fe I. The solar Fe/Si abundance ratio agrees with the meteoritic value found in C1 chrondrites. The resulting solar Fe I/Fe II abundance discrepancy is discussed.

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