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Title: IMPROVED Ni I log(gf) VALUES AND ABUNDANCE DETERMINATIONS IN THE PHOTOSPHERES OF THE SUN AND METAL-POOR STAR HD 84937

Atomic transition probability measurements for 371 Ni I lines in the UV through near-IR are reported. Branching fractions from data recorded using a Fourier transform spectrometer and a new echelle spectrograph are combined with published radiative lifetimes to determine these transition probabilities. Generally good agreement is found in comparisons to previously reported Ni I transition probability measurements. Use of the new echelle spectrograph, independent radiometric calibration methods, and independent data analysis routines enable a reduction of systematic errors and overall improvement in transition probability uncertainty over previous measurements. The new Ni I data are applied to high-resolution visible and UV spectra of the Sun and metal-poor star HD 84937 to derive new, more accurate Ni abundances. Lines covering a wide range of wavelength and excitation potential are used to search for non-LTE effects.
Authors:
;  [1] ;  [2] ;  [3]
  1. Department of Physics, University of Wisconsin, Madison, WI 53706 (United States)
  2. Department of Astronomy and McDonald Observatory, University of Texas, Austin, TX 78712 (United States)
  3. Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, OK 73019 (United States)
Publication Date:
OSTI Identifier:
22340293
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal, Supplement Series; Journal Volume: 211; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABUNDANCE; BRANCHING RATIO; CALIBRATION; DATA ANALYSIS; ERRORS; EXCITATION; FOURIER TRANSFORM SPECTROMETERS; LTE; METALS; NEAR INFRARED RADIATION; PHOTOSPHERE; RESOLUTION; SUN; ULTRAVIOLET SPECTRA; VISIBLE SPECTRA