Statistics – Computation
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...242..455t&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 242, no. 2, Feb. 1991, p. 455-473.
Statistics
Computation
48
Computational Astrophysics, Iron, Late Stars, Nonequilibrium Thermodynamics, Stellar Atmospheres, Metallicity, Photoionization, Radiation Distribution, Radiative Transfer, Stellar Spectra
Scientific paper
Non-LTE calculations based on the accelerated-lambda-iteration method are performed to investigate the statistical equilibrium of Fe in the atmosphere of Arcturus. Special emphasis is placed upon the handling of the realistic Fe I/Fe II atomic model, taking into account the cumulative effect of many levels and transitions. It is indicated that such accumulative effect tends to suppress the importance of non-LTE effect. The departure from LTE in the excitation equilibrium (i.e., line source function) appears to become appreciable mainly at rather high optically thin layers and thus may not be of substantial importance for the abundance determination from lines of moderate strength. Meanwhile, the significance of Fe I over-ionization effect due to the predominance of photoionization over recombination rates is found to depend strongly upon the treatment of photoionizing radiation. Appreciable systematic effect on the derived abundances is observed in the absence of line-blocking opacities, while the importance of this effect almost disappears if such blocking opacities are taken into consideration under the assumption of LTE pure absorption.
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