Welcome to the Los Alamos astrophysical opacity page. This page will
enable users to select and view precalculated opacity tables for a
selection of standard astrophysical mixtures as well as providing several
widely accepted variations in the Z composition for some of these
mixtures. The web page provides a broad range in X, Y and Z for
each mixture. Individual X-Y-Z tables or the entire set of X-Y-Z
tables for each mixture may be downloaded by the user for use in their model
calculations. There are more than 1500 Rosseland opacity tables available
to the user on this web page, which should satisfy most astrophysical
models. Tables not available on this web page can be calculated on the
main opacity web page.
Requests for nominating new mixtures to be added to this astrophysical
opacity page should be sent to the E-mail address given at the bottom of
the page.
General Information
New users should examine the information provided in the links given
below before proceeding. These links will list the paramater spaces
for the tables, give detailed information on all current materials and
discuss the advantages and limitations of using this web page instead of
the main opacity web page.
There is one limitation for these tables that must be realized by users
and this limitation is so important that you will see it listed on all
of the Web pages. These tables were calculated with atomic models and
have no molecular species in the equation of state and no molecular
cross sections in the opacity calculation. Users must provide their own
tables below 12,000 oK if they wish to include these important
molecular contributions.
Mixture Selection
This Web page is set up to allow users to examine or download a maximum of
one mixture at a time. Since this file can be over 1 megabyte in size,
it was felt that this is the practical upper limit for file transfers
at the present time. It is also possible for the user to download a
selected subset of the X-Y-Z tables. The options are given below:
1. (1+ megabytes) Full mixture with all X-Y-Z tables.
NOTE: Some mixtures are smaller.
2. (10+ kilobytes) Single X-Y-Z table for specified mixture. Individual
tables may be displayed and plotted and then downloaded.
3. (10+ kb/table) Depending on your browser and/or platform, users can
download a group or block of individual X-Y-Z tables.
These options can be exercised from the next Web Page after the mixture
is selected. This page will default to the standard Anders-Grevesse-Noels
mixture.
Ross-Aller (standard mix)
Anders-Grevesse-Noels (standard mix)
Anders-Grevesse-Noels (alpha enhance I)
Anders-Grevesse-Noels (alpha enhance II)
Anders-Grevesse-Noels (Na,Mg,Ti enhance)
Anders-Grevesse-Noels (V - Zn reduced)
Anders-Grevesse-Noels (N enhanced 2x)
Anders-Grevesse-Noels (N enhanced 4x)
Anders-Grevesse-Noels (N enhanced 8x)
Anders-Grevesse-Noels (N enhanced 16x)
Grevesse-Sauval (standard mix)
Grevesse-Sauval (Ne decreased by 15%)
Grevesse-Sauval (Ne increased by 15%)
May take up to 30 seconds to set up the tables for your mixture.
