Empirical NLTE analyses of solar spectral lines. III - Iron lines versus LTE models of the photosphere

Details Empirical NLTE analyses of solar spectral lines. III - Iron lines versus LTE models of the photosphere Empirical NLTE analyses of solar spectral lines. III - Iron lines versus LTE models of the photosphere

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...115..104r&link_type=abstract

Astronomy and Astrophysics, vol. 115, no. 1, Nov. 1982, p. 104-114.

Astronomy and Astrophysics

Astrophysics

42

Line Spectra, Photosphere, Solar Spectra, Stellar Models, Abundance, Atmospheric Models, Electron Energy, Iron, Spectrum Analysis, Thermodynamic Equilibrium

Scientific paper

We compare observational indications of departures from LTE in solar Fe I lines with published NLTE computations in the context of discrepancies between empirical LTE and NLTE models of the solar atmosphere. We find that the importance of departures from LTE in Fe I and similar spectra is often underestimated through neglect of opacity departures. We demonstrate with numerical experiments that the peculiarities of the LTE models are artifacts due to the neglect of NLTE departures; in particular, we so explain the Holweger-Müller LTE model quantitatively. However, we show also that the NLTE formation of most optical metal lines is fortuitously well-mimicked by LTE computation when using LTE models. Thus, LTE-derived metal abundances and empirical oscillator strengths happen to be fairly precise. The same may hold for the use of theoretical radiative- equilibrium models in stellar abundance determinations.

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