J/ApJS/63/661 Relativistic Free-Free Gaunt Factor (Nakagawa+ 1987)
Relativistic Free-Free Gaunt Factor of the Dense High-Temperature Stellar Plasma
Nakagawa M., Kohyama Y., Itoh N.
<Astrophys. J. Suppl. Ser. 63, 661 (1987)>
=1987ApJS...63..661N 1987ApJS...63..661N
ADC_Keywords: Atomic physics ; Opacities
Keywords: atomic processes - opacities - plasmas - relativity
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.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 139 120 *≪g_ff≫, degeneracy parameter η=-6.0
table2.dat 139 120 ≪g_ff≫, degeneracy parameter η=-2.0
table3.dat 139 120 ≪g_ff≫, degeneracy parameter η= 0.0
table4.dat 139 120 ≪g_ff≫, degeneracy parameter η= 1.0
table5.dat 139 120 ≪g_ff≫, degeneracy parameter η= 2.0
table6.dat 139 120 ≪g_ff≫, degeneracy parameter η= 3.0
table7.dat 139 120 ≪g_ff≫, degeneracy parameter η= 5.0
table8.dat 139 120 ≪g_ff≫, degeneracy parameter η=10.0
table9.dat 139 120 ≪g_ff≫, degeneracy parameter η=20.0
table10.dat 139 120 ≪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/ApJ/382/636 : Rosseland mean free-free Gaunt factor (Itoh+ 1991)
J/ApJS/74/291 : Relativistic Free-Free Gaunt Factor. II. (Itoh+ 1990)
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
120-128 E9.3 --- G+1.0 ? Gaunt factor, log(γ2)= 1.0
131-139 E9.3 --- G+2.0 ? Gaunt factor, log(γ2)= 2.0
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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 hydrogen
He - thermally averaged relativistic helium
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