Fitting and Smoothing of Opacity Data

Details Fitting and Smoothing of Opacity Data Fitting and Smoothing of Opacity Data

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.265l..25s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 265, NO. 3/DEC1, P. L25, 1993

Other

30

Radiative Transfer - Methods: Numerical - Stars: Interiors - Stars: Variables: Other

Scientific paper

Techniques are described for the fitting and smoothing of Rosseland mean opacities, κR(T, ρ), where T is the temperature and ρ the mass density, and for calculating the first two derivatives, ∂κR(/∂T|ρ and ∂κR(/∂ρ|T. The codes OPALFIT and OPFIT are available for the processing of opacities calculated by the projects OPAL and OP.
Both projects use techniques of opacity sampling (that is to say, a number of frequency points insufficient to resolve all detailed structures in monochromatic opacities), which lead to some lack of smoothness in the tabulated values of κR(T,ρ). It is shown that improved accuracy for the derivatives is obtained by using a technique of two-dimensional smoothing.

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