5.4.5 Equation of State

• 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:
  • 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.

• 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/a_bf/for/eos/dat