Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....59..299d&link_type=abstract
Astronomy and Astrophysics, vol. 59, no. 3, Aug. 1977, p. 299-301. NSF-supported research;
Astronomy and Astrophysics
Astrophysics
3
Absorption Spectra, Electron Transitions, Helium, Spectral Line Width, Stellar Atmospheres, Solar Spectra, Spectrum Analysis, Stellar Spectra, White Dwarf Stars
Scientific paper
Results are reported for measurements of the widths and shifts of the overlapping helium-broadened profiles of the Fe I absorption lines at 3719.94 and 3722.56 A, which were performed in a ballistic piston compressor using a saturated solution of FeCl3 in ethanol. It is found that at 4000 K, the 3719.94-A line has a gamma/n (FWHM) value of approximately 5.2 billionths rad/sec per cu cm, the blue shift of this line corresponds to a beta/n value of about 0.49 billionth rad/sec per cu cm, and the 3722.56-A line has the same values. These results are compared with previous experimental determinations and with theoretical calculations of neutral-line broadening for the Fe I lines. The significance of these measurements with respect to the solar spectrum and cool DG white dwarfs is discussed.
Driver R. D.
Lombardi Gabriel G.
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