Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....81..108o&link_type=abstract
Astronomy and Astrophysics, Vol. 81, P. 108, 1980
Astronomy and Astrophysics
Astrophysics
14
Scientific paper
The broadening of 42 low excitation lines of neutral iron has been measured when the lines were formed in absorption in a carbon tube furnace at about 2000 K under pressures of helium up to 700 Torr. The selection of lines included two complete 5F-5D multiplets and broadening parameters within each of these were found to vary by up to 20% from the mean value. A comparison of broadening parameters for transitions between many different LS terms provides evidence for a dependence of broadening on the quantum number S. A simple theoretical interpretation, which ignores these angular effects, permits a prediction, based on the measured broadening by helium, of the broadening likely to be produced by atomic hydrogen at temperatures typical of the solar atmosphere. The predicted are in good agreement with those deduced from solar profiles using accurate oscillator strengths and a recent analysis of the solar iron abundance.
Oneill J. A.
Smith Gordon
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