Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...160..132r&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 160, no. 1, May 1986, p. 132-134.
Astronomy and Astrophysics
Astrophysics
Absorption Spectra, Balmer Series, Line Spectra, Solar Atmosphere, Solar Spectra, Extrapolation, Iron, Thermodynamic Equilibrium
Scientific paper
A semi-empirical calculation of FeI absorption in continua and in weak lines near the series limits is based on an extrapolation of the table of observed spectral terms of neutral iron towards the ionization limit, combined with the use of a Kramers-law expression for the coefficient of continuous absorption, adjusted to the problem in question. The order of magnitude and the form of the wavelength dependence of this absorption matches that of the disagreement found at present between observed and calculated solar spectral intensities in the ultraviolet. The relatively great importance of iron absorption of this kind is an immediate consequence of the magnitude of the weight density of the FeI term system. It is thus directly connected with the great iron-line density in the solar spectrum.
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