Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...117...21r&link_type=abstract
Astronomy and Astrophysics, vol. 117, no. 1, Jan. 1983, p. 21-32.
Astronomy and Astrophysics
Astrophysics
12
Line Spectra, Photosphere, Solar Spectra, Spectrum Analysis, Thermodynamic Equilibrium, Abundance, Iron, Opacity
Scientific paper
The effects of departures from local thermodynamic equilibrium on the equivalent widths of solar Fe I lines are studied as an example for the analysis of the stellar curve of growth. The solar curve of growth obtained is based on the nonlocal thermodynamic equilibrium (NLTE) modeling of the solar spectrum of Lites (1972, 1973) and the best available oscillator strengths for 991 Fe I lines. The empirical curve obtained relating the equivalent width-wavelength ratio to the oscillator strength under NLTE is shown to differ appreciably from curves neglecting the NLTE ionization departures, although these effects may be corrected by assuming a NLTE-masking model. Theoretical NLTE curves of growth are also presented, and splittings due to wavelength dependency, differences in NLTE excitation, and variation in collisional damping, which are largely hidden by noise in observed values, are discussed. A new value for the solar iron abundance of 0.000047 times the hydrogen abundance is also derived.
Rutten Robert J.
Zwaan Cornelis
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