J/ApJS/167/292 Laboratory transition probabilities for Gd II (Den Hartog+, 2006)
Improved laboratory transition probabilities for Gd II and application to the
gadolinium abundances of the Sun and three r-process rich, metal-poor stars.
Den Hartog E.A., Lawler J.E., Sneden C., Cowan J.J.
<Astrophys. J. Suppl. Ser., 167, 292-314 (2006)>
=2006ApJS..167..292D 2006ApJS..167..292D
ADC_Keywords: Atomic physics
Keywords: atomic data - stars: abundances - stars: Population II -
Sun: abundances
Abstract:
Radiative lifetimes, accurate to ±5%, have been measured for 49
even-parity and 14 odd-parity levels of GdII using laser-induced
fluorescence. The lifetimes are combined with branching fractions
measured using Fourier transform spectrometry to determine transition
probabilities for 611 lines of Gd II. This work is the largest-scale
laboratory study to date of GdII transition probabilities and the
first using a high-performance Fourier transform spectrometer. This
improved data set has been used to determine a new solar photospheric
Gd abundance, logε=1.11±0.03. Revised Gd abundances have
also been derived for the r-process-rich metal-poor giant stars
CS 22892-052, BD +17 3248, and HD 115444. The resulting Gd/Eu
abundance ratios are in very good agreement with the solar system
r-process ratio. We have employed the increasingly accurate stellar
abundance determinations, resulting in large part from the more
precise laboratory atomic data, to predict directly the solar system
r-process elemental abundances for Gd, Sm, Ho, and Nd. Our analysis of
the stellar data suggests slightly higher recommended values for the
r-process contribution and total solar system values, consistent with
the photospheric determinations, for the elements for Gd, Sm, and Ho.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 64 611 Atomic transition probabilities for Gd II
organized by increasing wavelength in air
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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- 9 F9.3 0.1nm lambda Wavelength in air in Angstroms
11- 19 F9.3 cm-1 E1 Upper level energy
21- 22 A2 --- P1 Upper level parity (ev or od)
24- 26 F3.1 --- J1 Upper level J value
28- 36 F9.3 cm-1 E0 Lower level energy
38- 39 A2 --- P0 Lower level parity (ev or od)
41- 43 F3.1 --- J0 Lower level J value
45- 51 F7.3 10+6/s A(1-0) Transition probability
53- 58 F6.3 10+6/s e_TranP Total uncertainty in TranP
60- 64 F5.2 --- log(gf) Log of the degeneracy times the
oscillator strength
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 29-May-2008