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J/ApJ/382/636              Rosseland mean free-free Gaunt factor    (Itoh+ 1991)
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The Rosseland mean free-free Gaunt factor of the dense
high-Temperature stellar plasma
    Itoh N., Kuwashima F., Ichihashi K., Mutoh H.
   <Astrophys. J. 382, 636 (1991)>
   =1991ApJ...382..636I
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ADC_Keywords: Atomic physics ; Opacities
Keywords: atomic processes - dense matter - opacities - plasmas

Abstract:
    The Rosseland mean free-free Gaunt factor of the dense
    high-temperature stellar plasma is calculated, based on both the
    accurate relativistic cross section and Sommerfeld's exact
    nonrelativistic cross section. A wide range of electron degeneracy is
    accurately taken into account. Comparison of the resulting free-free
    opacity with the electron conduction opacity is made.

File Summary:
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 FileName     Lrecl     Records     Explanations
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ReadMe           80           .     Thi file
table1.dat      139          50    *Results of calculations of <<g^-1^>>
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Note on table1.dat: <<g^-1^>> is the Rossseland inverse Gaunt factor
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See also:
   J/ApJS/63/661 : Relativistic Free-Free Gaunt Factor (Nakagawa+ 1987)
   J/ApJS/74/291 : Relativistic Free-Free Gaunt Factor. II. (Itoh+ 1990)

Byte-by-byte Description of file: table1.dat
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   Bytes  Format Units   Label      Explanations
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   1-  4  F4.1   ---     Eta        Value of the degeneracy parameter, {eta}
   6-  7  A2     ---     Elem       Element for Gaunt factor calculation (1)
  10- 18  E9.3   ---     G-4.0      ? Gaunt factor, log({gamma}^2^) = -4.0
  21- 29  E9.3   ---     G-3.5      ? Gaunt factor, log({gamma}^2^) = -3.5
  32- 40  E9.3   ---     G-3.0      ? Gaunt factor, log({gamma}^2^) = -3.0
  43- 51  E9.3   ---     G-2.5      ? Gaunt factor, log({gamma}^2^) = -2.5
  54- 62  E9.3   ---     G-2.0      ? Gaunt factor, log({gamma}^2^) = -2.0
  65- 73  E9.3   ---     G-1.5      ? Gaunt factor, log({gamma}^2^) = -1.5
  76- 84  E9.3   ---     G-1.0      ? Gaunt factor, log({gamma}^2^) = -1.0
  87- 95  E9.3   ---     G-0.5      ? Gaunt factor, log({gamma}^2^) = -0.5
  98-106  E9.3   ---     G+0.0      ? Gaunt factor, log({gamma}^2^) =  0.0
 109-117  E9.3   ---     G+0.5      ? Gaunt factor, log({gamma}^2^) =  0.5
 120-128  E9.3   ---     G+1.0      ? Gaunt factor, log({gamma}^2^) =  1.0
 131-139  E9.3   ---     G+2.0      ? Gaunt factor, log({gamma}^2^) =  2.0
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Note (1): The Rosseland mean inverse Gaunt factor was calculated for the
           following:
                     H  - relativistic hydrogen
                     He - relativistic helium
                     C  - relativistic carbon
                     O  - relativistic oxygen
                     G  - exact nonrelativistic inverse Gaunt factor
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Origin: AAS CD-ROM series, Volume 9, 1997        Lee E. Brotzman [ADS] 27-Aug-97
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(End)                                                         [CDS]  05-Feb-1998