WSU Low Temperature Opacities

WSU Low Temperature Opacities

This page is a repository of opacity data based from the WSU opacity group, Prof. Ferguson et al.  Each set consists of a tar/gzip'd file that includes the tables of Rosseland Mean Opacity for that set.  The individual filenames include information about the various compositions, such as X = 0.7 and Z = 0.02 where X + Y + Z = 1.0.  There are either 126 or 155 compositions (depending when tables were made) for each base composition.

In addition the abundances for the basic set for each composition is given.  Depending on the composition source, the abundances are given in either log10 (n_H) = 12.0 units or number fractions.

F05 Opacities

Low Temperature Stellar Opacities based on Ferguson et al. 2005 (“Low Temperature Opacities”, Jason W. Ferguson, David R. Alexander, France Allard, Travis Barman, Julia G. Bodnarik, Peter H. Hauschildt, Amanda Heffner-Wong, Akemi Tamanai 2005, Astrophysical Journal, 623, 585.)

Alpha-enhanced opacities based on the Asplund et. al 2009 base abundances.

Methods discussed in Weiss & Ferguson 2009, A&A, 508, 1343 and used by Wagstaff & Weiss 2018, MNRAS, 477, 4824.

 Older AF94 opacities

Low Temperature Stellar Opacities based on Alexander & Ferguson 1994 (“Low Temperature Rosseland Opacities”, David R. Alexander & Jason W. Ferguson 1994, Astrophysical Journal, 437, 879.)