J/A+A/546/A55 Ge V and Ge VI oscillator strengths (Rauch+, 2012)
Stellar laboratories: new Ge V and Ge VI oscillator strengths and their
validation in the hot white dwarf RE 0503-289.
Rauch T., Werner K., Biemont E., Quinet P., Kruk J.W.
<Astron. Astrophys. 546, A55 (2012)>
=2012A&A...546A..55R 2012A&A...546A..55R
ADC_Keywords: Atomic physics
Keywords: atomic data - line: identification - stars: abundances -
stars: individual: RE 0503-289 - stars: white dwarfs -
virtual observatory tools
Abstract:
State-of-the-art spectral analysis of hot stars by means of non-LTE
model-atmosphere techniques has arrived at a high level of
sophistication. The analysis of high-resolution and high-S/N spectra,
however, is strongly restricted by the lack of reliable atomic data
for highly ionized species from intermediate-mass metals to trans-iron
elements. Especially data for the latter has only been sparsely
calculated. Many of their lines are identified in spectra of extremely
hot, hydrogen-deficient post-AGB stars. A reliable determination of
their abundances establishes crucial constraints for AGB
nucleosynthesis simulations and, thus, for stellar evolutionary
theory.
In a previous analysis of the UV spectrum of RE 0503-289, spectral
lines of highly ionized Ga, Ge, As, Se, Kr, Mo, Sn, Te, I, and Xe were
identified. Individual abundance determinations are hampered by the
lack of reliable oscillator strengths. Most of these identified lines
stem from Ge V. In addition, we identified Ge VI lines for the
first time. We calculated Ge V and Ge VI oscillator strengths in
order to reproduce the observed spectrum.
Description:
Calculated HFR oscillator strengths (log gf) and transition
probabilities (gA, in 1/s) in Ge V (table2.dat) and Ge VI
(table4.dat). CF is the cancellation factor as defined by Cowan (1981,
1981tass.book.....C 1981tass.book.....C). In columns 3 and 6, e is written for even and o
for odd.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 57 2159 Data for GeV
table4.dat 57 414 Data for GeVI
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Byte-by-byte Description of file: table2.dat table4.dat
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Bytes Format Units Label Explanations
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1- 9 F9.3 0.1nm lambda Wavelength
11- 16 I6 cm-1 E0 Lower level energy
18 A1 --- P0 [e/o] lower level parity (even or odd)
20- 22 F3.1 --- J0 [0/6] Lower level angular momentum quantum number
24- 29 I6 cm-1 E1 Upper level energy
31 A1 --- P1 [e/o] Upper level parity (even or odd)
33- 35 F3.1 --- J1 [0/6] Upper level angular momentum quantum number
37- 41 F5.2 [-] loggf Calculated HFR log gf value (1)
43- 50 E8.3 s-1 gA gA value (2)
52- 57 F6.3 --- CF CF cancellation factor as defined by Cowan (1981,
The theory of atomic structure and spectra, Los
Alamos Series in Basic and Applied Sciences,
Berkeley: University of California Press)
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Note (1): gf value defined as:
g: statistical weight of the lower level
f: oscillator strength
Note (2): gA value defined as:
g: statistical weight of the upper level
A: transition probability
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Acknowledgements:
Thomas Rauch, rauch(at)astro.uni-tuebingen.de
History:
04-Oct-2012: on-line data
15-May-2014: loggA corrected into gA (from author)
(End) Patricia Vannier [CDS] 28-Aug-2012