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Low‐TemperatureOpacities Jason W. FergusonD. R. AlexanderF. Allard2005 год

Low‐Temperature Opacities
статья из журнала

Полный текстСтраница публикацииПубликация в OpenAlex
Аннотация: Previous computations of low-temperature Rosseland and Planck mean opacities from Alexander & Ferguson are updated and expanded. The new computations include a more complete equation of state (EOS) with more grain species and updated optical constants. Grains are now explicitly included in thermal equilibrium in the EOS calculation, which allows for a much wider range of grain compositions to be accurately included than was previously the case. The inclusion of high-temperature condensates such as Al2O3 and CaTiO3 significantly affects the total opacity over a narrow range of temperatures before the appearance of the first silicate grains. The new opacity tables are tabulated for temperatures ranging from 30,000 to 500 K with gas densities from 10-4 to 10-19 g cm-3. Comparisons with previous Rosseland mean opacity calculations are discussed. At high temperatures, the agreement with OPAL and Opacity Project is quite good. Comparisons at lower temperatures are more divergent as a result of differences in molecular and grain physics included in different calculations. The computation of Planck mean opacities performed with the opacity sampling method is shown to require a very large number of opacity sampling wavelength points; previously published results obtained with fewer wavelength points are shown to be significantly in error. Methods for requesting or obtaining the new tables are provided.
Год издания: 2005
Авторы: Jason W. Ferguson, D. R. Alexander, F. Allard, Travis Barman, J. Bodnarik, Peter H. Hauschildt, Amanda Heffner‐Wong, Akemi Tamanai
Издательство: IOP Publishing
Источник: The Astrophysical Journal
Ключевые слова: High-pressure geophysics and materials, Advanced Chemical Physics Studies, Spectroscopy and Laser Applications
Другие ссылки: The Astrophysical Journal (PDF)
The Astrophysical Journal (HTML)
arXiv (Cornell University) (PDF)
DataCite API (HTML)