J/A+A/373/987 Non-LTE Ga abundance in HgMn stars (Zboril+ 2001)
Non-LTE gallium abundance in HgMn stars.
Zboril M., Berrington K.A.
<Astron. Astrophys. 373, 987 (2001)>
=2001A&A...373..987Z 2001A&A...373..987Z
ADC_Keywords: Stars, peculiar ; Abundances, peculiar ; Stars, atmospheres
Keywords: stars - abundances: atmospheres - chemically peculiar
Abstract:
We present, for the first time, the Non-LTE gallium equivalent widths
for the most prominent gallium transitions as identified in real
spectra and in (hot) mercury-manganese star. The common feature of the
departure coefficients is to decrease near the stellar surface, the
collision rates are dominant in many cases and the Non-LTE equivalent
widths are generally smaller. In particular, the abundance difference
as derived from UV and visual lines is reduced. The photoionization
cross sections were computed by means of standard R-matrix formalism.
Description:
The file legend contains simple legend to files with photo-ionization
cross sections for gallium.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
legend.dat 51 37 Legend of the gallium cross sections files
xsec/* . 36 Gallium cross sections
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See also:
VI/62 : Photoelectric absorption cross-sections (Balucinska-Church+, 1992)
J/A+AS/109/125 : Photoionisation cross section (Verner+, 1995)
Byte-by-byte Description of file: legend.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Ion Ion
7- 8 I2 --- Number Gallium level number
10- 16 F7.5 Ry Eexc Excitation energy
18- 24 F7.5 Ry Eion ? Ionization energy
26- 28 I3 --- LCode Energy level code
30- 36 A7 --- Term Energy level designation
38- 44 A7 --- FileName File name in "xsec" subdirectory
46 I1 --- DCode ? [1/4] Degeneracy code
48- 51 I4 --- Nline ? Number of lines in the file
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Byte-by-byte Description of file: xsec/3128.*
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Bytes Format Units Label Explanations
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3- 14 E12.6 --- Eph Photon energy
16- 24 E9.3 Mbarn sigma Photoionization cross section (G1)
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Byte-by-byte Description of file: xsec/3129.* xsec/3130.* xsec/3131.*
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Bytes Format Units Label Explanations
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1- 8 F8.5 --- Eph Photon energy
10- 18 E9.3 Mbarn sigma1 Photoionization cross section (G1)
20- 28 E9.3 Mbarn sigma2 ? Photoionization cross section (G1)
30- 38 E9.3 Mbarn sigma3 ? Photoionization cross section (G1)
40- 48 E9.3 Mbarn sigma4 ? Photoionization cross section (G1)
50- 58 E9.3 Mbarn sigma5 ? Photoionization cross section (G1)
60- 68 E9.3 Mbarn sigma6 ? Photoionization cross section (G1)
70- 78 E9.3 Mbarn sigma7 ? Photoionization cross section (G1)
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Global notes:
Note (G1): Cross-sections are expressed in Megabarn (10-22m2).
Zero means that for particular photon energy the cross section
was not calculated.
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Acknowledgements: Milan Zboril
(End) Patricia Bauer [CDS] 28-May-2001