Mathematics – Probability
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...140..334s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 140, no. 2, Nov. 1984, p. 334-340. Research supported by the Naturvetenskaplig
Mathematics
Probability
13
Absorptivity, Chemical Composition, Distribution Functions, Opacity, Stellar Atmospheres, Algorithms, Carbon Stars, Numerical Integration, Probability Density Functions, Red Giant Stars
Scientific paper
An efficient method is presented for calculating composite opacity distribution functions (ODFs) for several opacity sources using the ODFs for each individual source. This algorithm makes it possible to change the chemical composition in the calculation of blanketed model atmospheres without recalculating the ODFs. The algorithm assumes that the strength of the opacity sources affected by the abundance change are uncorrelated in frequency with each other and with the rest of the opacity, within narrow spectral intervals. The mathematical basis of the method is introduced, the different numerical parts of the algorithm are described, and the accuracy and efficiency of the method is discussed together with some numerical examples.
Gustafsson Bengt
Saxner M.
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