CDROM/APJS/V99/P713     Equation of State (Saumon+ 1995)
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An Equation of State for Low-Mass Stars and Giant Planets
      D. Saumon, G. Chabrier, And H. M. Van Horn
      <1995, ApJS, 99, 713>
      =1995ApJS...99..713S
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Abstract:
     We present new equations of state (EOS) for hydrogen and helium,
  intended for applications to low-mass stars (M < 1 Msun), brown
  dwarfs, and giant planets.  They cover the range 2.10 < log T(K) <
  7.06 and 4 < log P (dyn/cm2) < 19 and include new physical treatments
  of partial dissociation and ionization caused by both pressure and
  temperature effects.  The hydrogen EOS is based on a careful study of
  nonideal interactions.  In the case of helium, the principal features
  of the EOS physics are retained in a simplified model.  The
  calculation is based on the free energy minimization method, and a
  detailed account of the physical model has been published elsewhere.
  Mixtures of hydrogen and helium are obtained with the additive volume
  rule and an additional ideal entropy-of-mixing term.  In this paper,
  we present extensive tabular results for both the H and He EOS,
  together with a critical analysis.  Part of this analysis is based on
  a comparison with other EOS commonly used in astrophysics.  Both EOS
  everywhere satisfy the requirements of thermal and mechanical
  stability and are thermodynamically consistent over most of the phase
  diagram.  A complete set of tables is available in the AAS CD-ROM
  Series, Vol. 5, and by anonymous FTP.

Keywords: equation of state -- planetary systems -- stars:
     interiors -- stars: low-mass, brown dwarfs

Description:
  The data files for this paper are not in a format that is easily
  translated into FITS format.  The author-supplied documentation
  (readme.doc) and sample Fortran code for reading data files adequately
  describe the data and the reader is referred to that document for more 
  information.


File Summary:
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File Name    Lrecl    Records   Explanations
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readme.doc     104        161   Author-supplied documentation
read.f          69         34   FORTRAN program showing how to read the tables
h_tab_i.dat    104       3783   Hydrogen equation of state table
h_tab_p1.dat   104        714   Hydrogen EOS table for Phase I of the plasma 
                                phase transition
h_tab_p2.dat   104        884   Hydrogen EOS table for Phase II of the plasma 
                                phase transition
he_tab_i.dat   104       3783   Helium EOS table
rho_crit.dat    42          9   Coexistence curve of the plasma phase transition
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(End)                                               Lee Brotzman [ADS] 31-Aug-95