Malmö University Publications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Transition probabilities of astrophysical interest in the niobium ions Nb+ and Nb2+
Lund Observatory, Lund University, Box 43, 221 00 Lund, Sweden.ORCID iD: 0000-0003-0375-6076
Lund Observatory, Lund University, Box 43, 221 00 Lund, Sweden.ORCID iD: 0000-0001-9853-2555
Department of Physics, Lund University, Box 118, 221 00 Lund, Sweden.
Department of Physics, Lund University, Box 118, 221 00 Lund, Sweden.
Show others and affiliations
2010 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 511, article id A16Article in journal (Refereed) Published
Abstract [en]

Aims. We attempt to derive accurate transition probabilities for astrophysically interesting spectral lines of Nb II and Nb III and determine the niobium abundance in the Sun and metal-poor stars rich in neutron-capture elements.Methods. We used the time-resolved laser-induced fluorescence technique to measure radiative lifetimes in Nb II. Branching fractions were measured from spectra recorded using Fourier transform spectroscopy. The radiative lifetimes and the branching fractions were combined yielding transition probabilities. In addition, we calculated lifetimes and transition probablities in Nb II and Nb III using a relativistic Hartree-Fock method that includes core polarization. Abundances of the sun and five metal-poor stars were derived using synthetic spectra calculated with the MOOG code, including hyperfine broadening of the lines.Results. We present laboratory measurements of 17 radiative lifetimes in Nb II. By combining these lifetimes with branching fractions for lines depopulating the levels, we derive the transition probabilities of 107 Nb II lines from 4d35p configuration in the wavelength region 2240-4700 Å. For the first time, we present theoretical transition probabilities of 76 Nb III transitions with wavelengths in the range 1430-3140 Å. The derived solar photospheric niobium abundance log    = 1.44   0.06 is in agreement with the meteoritic value. The stellar Nb/Eu abundance ratio determined for five metal-poor stars confirms that the r-process is a dominant production method for the n-capture elements in these stars.

Place, publisher, year, edition, pages
EDP Sciences, 2010. Vol. 511, article id A16
National Category
Astronomy, Astrophysics and Cosmology Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:mau:diva-63302DOI: 10.1051/0004-6361/200913574ISI: 000275752400033Scopus ID: 2-s2.0-77950385251OAI: oai:DiVA.org:mau-63302DiVA, id: diva2:1808551
Available from: 2023-10-31 Created: 2023-10-31 Last updated: 2023-11-01Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopus

Authority records

Nilsson, H.Hartman, H.

Search in DiVA

By author/editor
Nilsson, H.Hartman, H.
In the same journal
Astronomy and Astrophysics
Astronomy, Astrophysics and CosmologyAtom and Molecular Physics and Optics

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 6 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf