CDROM/APJS/V074/P291 Relativistic Free-Free Gaunt Factor. II. (Itoh+ 1990) ================================================================================ Relativistic Free-Free Gaunt Factor of the Dense High-Temperature Stellar Plasma. II. Carbon and Oxygen Plasmas Naoki Itoh, Koichi Kojo, and Masayuki Nakagawa <1990, ApJS, 74, 291> =1990ApJS...74..291I ================================================================================ Abstract: The pure Coulomb free-free Gaunt factors of the dense high-temperature carbon and oxygen plasmas are calculated by using the accurate relativistic cross section and are compared with the Gaunt factors derived by using Sommerfeld's exact nonrelativistic cross section. A wide range of electron degeneracy is accurately taken into account. Effects from resonances in the free electron density of states are not included. Dramatic 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 117 120 <>, degeneracy parameter eta = -6.0 table2.dat 117 120 <>, degeneracy parameter eta = -2.0 table3.dat 117 120 <>, degeneracy parameter eta = 0.0 table4.dat 117 120 <>, degeneracy parameter eta = 1.0 table5.dat 117 120 <>, degeneracy parameter eta = 2.0 table6.dat 117 120 <>, degeneracy parameter eta = 3.0 table7.dat 117 120 <>, degeneracy parameter eta = 5.0 table8.dat 117 120 <>, degeneracy parameter eta = 10.0 table9.dat 117 120 <>, degeneracy parameter eta = 20.0 table10.dat 117 120 <>, 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 -------------------------------------------------------------------------------- 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 carbon He - thermally averaged relativistic oxygen G - thermally averaged nonrelativistic free-free Gaunt factor -------------------------------------------------------------------------------- ================================================================================ (End) Lee E. Brotzman [ADS] 28-Aug-97