7.1.6 Equation of state

7.1.6.1 character eosfile

The equation of state file together with the opacity file implicitly determine the chemical composition. The EOS file can be specified for instance with

character eosfile f=A80 b=80 n='EOS file name' &
  c0=eos_gamma140.eos/eos_mm20_l.eos/eos_mm00_l3.eos
eos_mm00_l5.eos

There exists an increasing number of files, e.g.:

• eos_mm00_l3.eos: Standard EOS file for solar composition with extra large density range (towards low densities). There exist two other files for the same composition but smaller density range (eos_mm00.eos, eos_mm00_l.eos)
• eos_XXXX_l4.eos: Several EOS tables for various compositions.
• eos_mm00_l5.eos: EOS file for solar composition, with temperature range extended to very low values by keeping $\mu$ fixed below 500K. The number of points for the density sampling has been reduced. The number of points for the energy sampling has been increased.
• eos_mm20_l.eos: Standard EOS file for metal-poor star ([M/H]=-2.0) with extended range in internal energy and density (towards lower values). The older file (eos_mm20.eos) did not reach far enough.
• eos_gamma140.eos: EOS table for simple gas with constant $\Gamma$=1.4. In this case all quantities could be faster computed than by interpolation in a table. Nevertheless, for compatibility reasons (to be able to use the existing EOS Fortran routines), the table is provided.
• eos_gamma166.eos: EOS table for simple gas with constant $\Gamma$=5/3.
• cpheos_mm00.eos: Copenhagen EOS for (their) solar composition.

7.1.6.2 character eospath

The equation of state file does not have to be in the working directory. Instead, its path can be specified e.g. with

character eospath f=A80 b=80 n='path of EOS file' &
  c0=/astro/b/bf/for/eos/dat
/home/bf/for/eos/dat