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Title:
Low-temperature Rosseland opacities
Authors:
Alexander, D. R.; Ferguson, J. W.
Affiliation:
AA(Wichita State University, Wichita, KS, US), AB(Wichita State University, Wichita, KS, US)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 437, no. 2, p. 879-891 (ApJ Homepage)
Publication Date:
12/1994
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
COSMIC DUST, EMISSION SPECTRA, LOW TEMPERATURE, MOLECULAR SPECTRA, OPACITY, PLANCKS CONSTANT, RADIATIVE TRANSFER, ABSORPTION SPECTRA, EQUATIONS OF STATE, NUMERICAL ANALYSIS, RAYLEIGH SCATTERING, TEMPERATURE DISTRIBUTION, TRIATOMIC MOLECULES
DOI:
10.1086/175039
Bibliographic Code:
1994ApJ...437..879A

Abstract

A new, comprehensive set of low-temperature opacity data has been assembled. From this basic data set, Rosseland and Planck mean opacities have been computed for temperatures between 12,500 and 700 K. In addition to the usual continuous absorbers, atomic line absorption (with more than 8 million lines), molecular line absorption (with nearly 60 million lines), and grain absorption and scattering (by silicates, iron, carbon, and SiC) have been accounted for. The absorption due to lines is computed monochromatically and included in the mean with the opacity sampling technique. Grains are assumed to form in chemical equilibrium with the gas and to form into a continuous distribution of ellipsoids. Agreement of these opacities with other recent tabulations of opacities for temperatures above 5000 K is excellent. It is shown that opacities which neglect molecules become unreliable for temperatures below 5000 K. Triatomic molecules become important absorbers at 3200 K. Similarly, grains must be included in the computation for temperatures below 1700 K.

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