J/A+A/459/307 Fe XVIII Benchmarking atomic data (Del Zanna+, 2006)
Benchmarking atomic data for astrophysics: Fe XVIII.
Del Zanna G.
<Astron. Astrophys., 459, 307-316 (2006)>
=2006A&A...459..307D 2006A&A...459..307D
ADC_Keywords: Atomic physics
Keywords: atomic data - X-rays: stars - techniques: spectroscopic
Abstract:
Fe XVIII produces, in the X-ray and extreme ultraviolet, L-shell
(n=2,3,4->2) spectral lines which are among the brightest ones in e.g.
solar flares and in Chandra, XMM-Newton spectra of active stars.
Recent R-matrix scattering calculations of Witthoeft et al.
(2006A&A...446..361W 2006A&A...446..361W) produce theoretical intensities for some of the
brightest transitions increased by large factors (2-3), so it is
timely to use these calculations to review and assess all previous
line identifications on a quantitative basis. This paper discusses
only the most important lines for laboratory and astrophysical
applications. Many previous identifications are revised and some
tentative ones finally confirmed. Many lines are found to be
significantly blended. A considerable number of new identifications
are proposed. Excellent agreement between observed and predicted
intensities is found in the majority of cases for the first time. It
is therefore now possible to use Fe XVIII L-shell lines to measure
electron densities in laboratory plasmas and temperatures for a wide
range of astrophysical sources.
Description:
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* *
* Sorry, but the author(s) never supplied the tabular material *
* (full table 2 and table A1) announced in the paper *
* *
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 14 23 The configurations used to calculate the energy
levels and the radiative data
table2.dat 107 128 The details of some of the levels in the most
important configurations in Fe XVIII
table3.dat 120 71 Line identifications
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See also:
J/A+A/433/731 : Fe XII Benchmarking atomic data (Del Zanna+, 2005)
J/A+A/422/731 : Fe X Benchmarking atomic data (Del Zanna+, 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Code Configuration code
5- 14 A10 --- Conf Configuration
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Index Energy level index
5- 64 A60 --- Conf Configuration and percentage mixing
66- 77 A12 --- Level Level
79- 87 F9.1 cm-1 E Energy (best estimate)
89- 92 I4 cm-1 e_E rms uncertainty on Ebest (1)
94- 99 I6 cm-1 E-Enist ?=- Best energy minus NIST v.3 energy
Enist: energy as in the NIST database
102-107 I6 cm-1 E-Ecc ?=- Best energy minus CC energy (2)
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Note (1): The uncertainties in the energies reflect the estimated errors
in the wavelength measurements.
Levels with uncertain identification are assigned an uncertainty
of 5000cm-1.
Note (2): Ecc: energy from the scattering calculation from
Witthoeft et al., 2006A&A...446..361W 2006A&A...446..361W
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1 I1 --- i i level
2 A1 --- --- [-]
3- 5 I3 --- j j level
7- 12 E6.2 ph RInt12 Relative intensity at 1012cm-3 (1)
14- 19 E6.2 ph RInt19 Relative intensity at 1019cm-3 (1)
21- 27 F7.3 0.1nm LambdaB Best wavelength
29- 30 I2 0.1pm e_LambdaB ? rms uncertainty on LambdaBest
33 A1 --- --- [?]
34- 40 F7.3 0.1nm LambdaO Observed wavelength
42- 44 I3 0.1pm e_LambdaO rms uncertainty on LambdaObs
47- 51 A5 --- Ref Reference (3)
52- 65 A14 --- Blend Blend (2)
69- 98 A30 --- SameID Reference for same identification (3)
99-120 A22 --- DiffID Reference for different identification (3)
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Note (1): The relative intensities (in photons, at densities 1012,
1019cm-3) were scaled to the strong 1-56+1-55 14.204Å blend,
and calculated at logT=6.8
Note (2): Some blends are indicated as follows:
bl = blend
bl u = blend with an unidentified line
Note (3): References as follows:
Bo70 = Boiko et al., 1970, Opt. Spectrosc., 29, 1023
Bo78 = Boiko et al., J. Quant. Spectrosc. Rad. Trans., 19, 11
Br77a = Bromage et al., 1977, MNRAS, 178, 599
Br77 = Bromage et al., 1977, RAL Report, 170
Co68 = Cohen et al., 1968 J. Opt. Soc. Am. (1917-1983), 58, 331
Co92 = Cornille et al., 1992, A&A, 259, 669
Dere78 = Dere, 1978ApJ...221.1062D 1978ApJ...221.1062D
Do75 = Doschek et al., 1975, ApJ, 196, L83
Fa67 = Fawcett et al., 1967, Proc. Phys. Soc., 89, 863
Fe73 = Feldman et al., 1973, J. Opt. Soc. Am. (1917-1983), 63, 1445
Fe73b = Feldman et al., 1973, ApJ, 183, L43
P84 = Peacock et al., 1984, Phys. Scri. T, 8, 10
Ph82 = Phillips et al., 2001MNRAS.325.1500P 2001MNRAS.325.1500P
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 11-May-2007