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J/A+A/606/A127    FeI photoionization cross sections and ECS   (Bautista+, 2017)

Photoionization and electron impact excitation cross sections for FeI. Bautista M.A., Lind K., Bergemann M. <Astron. Astrophys. 606, A127 (2017)> =2017A&A...606A.127B (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics Keywords: atomic data - atomic processes - radiative transfer - Sun: atmosphere - stars: atmospheres Abstract: Iron is a major contributor to the opacity in the atmospheres of late-type stars, as well as a major contributor to the observed lines in their visible spectrum. Iron lines are commonly used to derive basic stellar parameters from medium/high resolution spectroscopy, that is, spectroscopy which shows metal content, effective temperature, and surface gravity. Here we present large R-matrix calculations for photoionization cross sections and electron impact collision strengths. Description: Two electronic files are provided with this publication. These are: xsection.txt. This table lists the total photoionization cross sections for all states of FeI found in the calculation. table5.dat. This table contains the Maxwellian averaged effective collision strengths for FeI. The effective collision strengths are listed for five temperatures between 3000 and 20,000K File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4.dat 48 46 LS terms of iron included in the electron impact collision strengths calculation table5.dat 67 1035 Effective collision strengths for FeI for 6 different temperatures xsections.txt 74 1628801 Total photoionization cross section for FeI
Description of file: xsections.txt Total photoionization cross section for FeI First line: 2 I1 --- 2S+1 State's multiplicity (2S+1) 4 I1 --- L State's orbital angular momentum (L) 6 I1 --- P State's parity 8- 9 I2 --- CF configuration number (in the order listed in Table 1) Second line: 5- 14 E12.6 Ry E0 State's energy relative to the ground state of Fe^+ 18- 21 I4 --- N number of energies in the cross section Subsequent lines: 1- 14 E14.9 Ryd Eph Photon energy 17- 25 E9.5 --- CS Photoionization cross section (Mb) Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 2 I2 --- CF Sequential number 4- 24 A21 --- Conf Configuration 28- 36 A9 --- Term Term 39- 48 F10.8 Ry E Energy
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
2- 3 I2 --- i0 Index of lower level in the transition 6- 7 I2 --- i1 Index of upper level in the transition 9- 17 E9.4 --- ECS3 Effective collision strength at T=3000K 19- 27 E9.4 --- ECS5 Effective collision strength at T=5000K 29- 37 E9.4 --- ECS8 Effective collision strength at T=8000K 39- 47 E9.4 --- ECS10 Effective collision strength at T=10000K 49- 57 E9.4 --- ECS15 Effective collision strength at T=15000K 59- 67 E9.4 --- ECS20 Effective collision strength at T=20000K
Acknowledgements: Manuel Bautista, manuel.bautista(at)
(End) Patricia Vannier [CDS] 19-Sep-2017
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