Transition probabilities of astrophysical interest in the niobium ions Nb+ and Nb2+

Details Transition probabilities of astrophysical interest in the niobium ions Nb+ and Nb2+ Transition probabilities of astrophysical interest in the niobium ions Nb+ and Nb2+

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010a%26a...511a..16n&link_type=abstract

Astronomy and Astrophysics, Volume 511, id.A16

Astronomy and Astrophysics

Astrophysics

5

Atomic Data, Atomic Processes, Sun: Abundances, Stars: Abundances

Scientific paper

Aims: We attempt to derive accurate transition probabilities for astrophysically interesting spectral lines of ion{Nb}{ii} and ion{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 ion{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 ion{Nb}{ii} and ion{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 ion{Nb}{ii}. By combining these lifetimes with branching fractions for lines depopulating the levels, we derive the transition probabilities of 107 ion{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 ɛ_&sun; = 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.

Affiliated with

Also associated with

No associations

Rating

Transition probabilities of astrophysical interest in the niobium ions Nb+ and Nb2+ does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Transition probabilities of astrophysical interest in the niobium ions Nb+ and Nb2+, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transition probabilities of astrophysical interest in the niobium ions Nb+ and Nb2+ will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1306663