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Low Temperature Opacities | | Jason W. Ferguson
; David R. Alexander
; France Allard
; Travis Barman
; Julia G. Bodnarik
; Peter H. Hauschildt
; Amanda Heffner-Wong
; Akemi Tamanai
; | | Date: |
2 Feb 2005 | | Journal: | Astrophys.J. 623 (2005) 585-596 | | Subject: | astro-ph | | Abstract: | Previous computations of low temperature Rosseland and Planck mean opacities from Alexander & Ferguson (1994) are updated and expanded. The new computations include a more complete equation of state with more grain species and updated optical constants. Grains are now explicitly included in thermal equilibrium in the equation of state 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 Al$_2$O$_3$ and CaTiO$_3$ 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 30000 K to 500 K with gas densities from 10$^{-4}$ g cm$^{-3}$ 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 are 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. | | Source: | arXiv, astro-ph/0502045 | | Services: | Forum | Review | PDF | Favorites | |
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