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New Zr II oscillator strengths and the zirconium conflict in the HgMn star chi Lupi

Sikstrom, C. M; Lundberg, Hans LU ; Wahlgren, G. M; Li, Z. S; Lynga, C; Johansson, S and Leckrone, D. S (1999) In Astronomy & Astrophysics 343(1). p.297-302
Abstract
Lifetimes on the sub-nanosecond scale for the levels v(2)D(3/2), v(2)F(3/2) and v(2)F(5/2) in the 4d5s5p configuration in Zr II have been measured, using the method of laser-induced fluorescence. Combined with branching fractions obtained with the Lund Ultraviolet (UV) Fourier Transform Spectrometer (FTS), experimental oscillator strengths have been derived. From Hubble Space Telescope/Goddard High-Resolution Spectrograph spectra, the zirconium abundance in the HgMn star chi Lupi has been determined from Zr II and Zr III lines. More than an order of magnitude difference in the Zr II abundance has been derived from these ionization stages. The difference is much too large to be explained by uncertainties in the oscillator strengths.... (More)
Lifetimes on the sub-nanosecond scale for the levels v(2)D(3/2), v(2)F(3/2) and v(2)F(5/2) in the 4d5s5p configuration in Zr II have been measured, using the method of laser-induced fluorescence. Combined with branching fractions obtained with the Lund Ultraviolet (UV) Fourier Transform Spectrometer (FTS), experimental oscillator strengths have been derived. From Hubble Space Telescope/Goddard High-Resolution Spectrograph spectra, the zirconium abundance in the HgMn star chi Lupi has been determined from Zr II and Zr III lines. More than an order of magnitude difference in the Zr II abundance has been derived from these ionization stages. The difference is much too large to be explained by uncertainties in the oscillator strengths. Possible explanations of this difference have to be found in the stellar models, such as the influence of non-LTE or diffusion. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Astronomy & Astrophysics
volume
343
issue
1
pages
297 - 302
publisher
EDP Sciences
ISSN
0004-6361
language
English
LU publication?
yes
id
d7e83118-3177-40dd-b5b0-2016db2e548d (old id 2259370)
alternative location
http://adsabs.harvard.edu/abs/1999A&A...343..297S
date added to LUP
2012-02-10 00:26:11
date last changed
2016-09-20 15:08:09
@misc{d7e83118-3177-40dd-b5b0-2016db2e548d,
  abstract     = {Lifetimes on the sub-nanosecond scale for the levels v(2)D(3/2), v(2)F(3/2) and v(2)F(5/2) in the 4d5s5p configuration in Zr II have been measured, using the method of laser-induced fluorescence. Combined with branching fractions obtained with the Lund Ultraviolet (UV) Fourier Transform Spectrometer (FTS), experimental oscillator strengths have been derived. From Hubble Space Telescope/Goddard High-Resolution Spectrograph spectra, the zirconium abundance in the HgMn star chi Lupi has been determined from Zr II and Zr III lines. More than an order of magnitude difference in the Zr II abundance has been derived from these ionization stages. The difference is much too large to be explained by uncertainties in the oscillator strengths. Possible explanations of this difference have to be found in the stellar models, such as the influence of non-LTE or diffusion.},
  author       = {Sikstrom, C. M and Lundberg, Hans and Wahlgren, G. M and Li, Z. S and Lynga, C and Johansson, S and Leckrone, D. S},
  issn         = {0004-6361},
  language     = {eng},
  number       = {1},
  pages        = {297--302},
  publisher    = {ARRAY(0xabb9dc0)},
  series       = {Astronomy & Astrophysics},
  title        = {New Zr II oscillator strengths and the zirconium conflict in the HgMn star chi Lupi},
  volume       = {343},
  year         = {1999},
}