CDROM/APJS/V063/P661 Relativistic Free-Free Gaunt Factor (Nakagawa+ 1987) ================================================================================ Relativistic Free-Free Gaunt Factor of the Dense High-Temperature Stellar Plasma Masayuki Nakagawa, Yasuharu Kohyama, and Naoki Itoh <1987, ApJS, 63, 661> =1987ApJS...63..661N ================================================================================ Abstract: The free-free Gaunt factor of the dense high-temperature stellar plasma is calculated by using the accurate relativistic cross section and is compared with the Gaunt factor derived by using Sommerfeld's exact nonrelativistic cross section. A wide range of electron degeneracy is accurately taken into account. Significant deviations from the nonrelativistic results are found for high-temperature cases. Results are presented in the form of extensive tables to facilitate applications. Keywords: atomic processes - opacities - plasmas - relativity File Summary: -------------------------------------------------------------------------------- File Name Lrecl Records Explanations -------------------------------------------------------------------------------- table1.dat 139 120 <>, degeneracy parameter eta = -6.0 table2.dat 139 120 <>, degeneracy parameter eta = -2.0 table3.dat 139 120 <>, degeneracy parameter eta = 0.0 table4.dat 139 120 <>, degeneracy parameter eta = 1.0 table5.dat 139 120 <>, degeneracy parameter eta = 2.0 table6.dat 139 120 <>, degeneracy parameter eta = 3.0 table7.dat 139 120 <>, degeneracy parameter eta = 5.0 table8.dat 139 120 <>, degeneracy parameter eta = 10.0 table9.dat 139 120 <>, degeneracy parameter eta = 20.0 table10.dat 139 120 <>, degeneracy parameter eta = 40.0 -------------------------------------------------------------------------------- Byte-by-byte Description of file: table1.dat table2.dat table3.dat table4.dat table5.dat table6.dat table7.dat table8.dat table9.dat table10.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 4 F4.1 --- Logu *Log u, u = (h_bar * omega) / kT 5 1X --- --- Blank 6- 7 A2 --- Elem *Element for Gaunt factor calculation 8-18 D11.3 --- G-4.0 []? Gaunt factor, log Gamma^2 = -4.0D+00 19-29 D11.3 --- G-3.5 []? Gaunt factor, log Gamma^2 = -3.5D+00 30-40 D11.3 --- G-3.0 []? Gaunt factor, log Gamma^2 = -3.0D+00 41-51 D11.3 --- G-2.5 []? Gaunt factor, log Gamma^2 = -2.5D+00 52-62 D11.3 --- G-2.0 []? Gaunt factor, log Gamma^2 = -2.0D+00 63-73 D11.3 --- G-1.5 []? Gaunt factor, log Gamma^2 = -1.5D+00 74-84 D11.3 --- G-1.0 []? Gaunt factor, log Gamma^2 = -1.0D+00 85-95 D11.3 --- G-0.5 []? Gaunt factor, log Gamma^2 = -5.0D-01 96-106 D11.3 --- G+0.0 []? Gaunt factor, log Gamma^2 = 0.0D+00 107-117 D11.3 --- G+0.5 []? Gaunt factor, log Gamma^2 = 5.0D-01 118-128 D11.3 --- G+1.0 []? Gaunt factor, log Gamma^2 = 1.0D+00 129-139 D11.3 --- G+2.0 []? Gaunt factor, log Gamma^2 = 2.0D+00 -------------------------------------------------------------------------------- Notes for file: table1.dat table2.dat table3.dat table4.dat table5.dat table6.dat table7.dat table8.dat table9.dat table10.dat -------------------------------------------------------------------------------- Logu: Log u, where u = (h_bar * omega) / kT, and omega is the angular frequency of the absorbed photon. Elem: The free-free Gaunt factor was calcluated for the following: H - thermally averaged relativistic hydrogen He - thermally averaged relativistic helium G - thermally averaged nonrelativistic free-free Gaunt factor -------------------------------------------------------------------------------- ================================================================================ (End) Lee E. Brotzman [ADS] 28-Aug-97