J/ApJS/74/291 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
Itoh N., Kojo K., Nakagawa M.
<Astrophys. J. Suppl. Ser. 74, 291 (1990)>
=1990ApJS...74..291I 1990ApJS...74..291I
ADC_Keywords: Atomic physics ; Opacities
Keywords: atomic processes - opacities - plasmas - relativity
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.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 117 120 *≪g_ff≫, degeneracy parameter η=-6.0
table2.dat 117 120 ≪g_ff≫, degeneracy parameter η=-2.0
table3.dat 117 120 ≪g_ff≫, degeneracy parameter η= 0.0
table4.dat 117 120 ≪g_ff≫, degeneracy parameter η= 1.0
table5.dat 117 120 ≪g_ff≫, degeneracy parameter η= 2.0
table6.dat 117 120 ≪g_ff≫, degeneracy parameter η= 3.0
table7.dat 117 120 ≪g_ff≫, degeneracy parameter η= 5.0
table8.dat 117 120 ≪g_ff≫, degeneracy parameter η=10.0
table9.dat 117 120 ≪g_ff≫, degeneracy parameter η=20.0
table10.dat 117 120 ≪g_ff≫, degeneracy parameter η=40.0
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Note to table1.dat: ≪g_ff≫ is the exact nonrelativistic free-free Gaunt factor
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See also:
J/ApJS/63/661 : Relativistic Free-Free Gaunt Factor (Nakagawa+ 1987)
J/ApJ/382/636 : Rosseland mean free-free Gaunt factor (Itoh+ 1991)
Byte-by-byte Description of file: table*.dat
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Bytes Format Units Label Explanations
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1- 4 F4.1 --- Logu *Log u, u=(hbar*ω)/kT
6- 7 A2 --- Elem *Element for Gaunt factor calculation
10- 18 E9.3 --- G-4.0 ? Gaunt factor, log(γ2)= -4.0
21- 29 E9.3 --- G-3.5 ? Gaunt factor, log(γ2)= -3.5
32- 40 E9.3 --- G-3.0 ? Gaunt factor, log(γ2)= -3.0
43- 51 E9.3 --- G-2.5 ? Gaunt factor, log(γ2)= -2.5
54- 62 E9.3 --- G-2.0 ? Gaunt factor, log(γ2)= -2.0
65- 73 E9.3 --- G-1.5 ? Gaunt factor, log(γ2)= -1.5
76- 84 E9.3 --- G-1.0 ? Gaunt factor, log(γ2)= -1.0
87- 95 E9.3 --- G-0.5 ? Gaunt factor, log(γ2)= -0.5
98-106 E9.3 --- G+0.0 ? Gaunt factor, log(γ2)= 0.0
109-117 E9.3 --- G+0.5 ? Gaunt factor, log(γ2)= 0.5
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Note on Logu:
Log u, where u=(hbar*ω)/kT, and ω is the angular
frequency of the absorbed photon.
Note on Elem:
The free-free Gaunt factor was calculated for the following:
H - thermally averaged relativistic carbon
He - thermally averaged relativistic oxygen
G - thermally averaged nonrelativistic free-free Gaunt factor
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Origin: AAS CD-ROM series, Volume 9, 1997 Lee E. Brotzman [ADS] 28-Aug-97
(End) [CDS] 06-Feb-1998