Improved Laboratory Transition Probabilities for Nd II and Application to the Neodymium Abundances of the Sun and Three Metal-poor Stars

Details Improved Laboratory Transition Probabilities for Nd II and Application to the Neodymium Abundances of the Sun and Three Metal-poor Stars Improved Laboratory Transition Probabilities for Nd II and Application to the Neodymium Abundances of the Sun and Three Metal-poor Stars

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apjs..148..543d&link_type=abstract

The Astrophysical Journal Supplement Series, Volume 148, Issue 2, pp. 543-566.

Astronomy and Astrophysics

Astronomy

104

Atomic Data, Stars: Abundances, Sun: Abundances

Scientific paper

Radiative lifetimes, accurate to +/-5%, have been measured for 168 odd-parity levels of Nd II using laser-induced fluorescence. The lifetimes are combined with branching fractions measured using Fourier-transform spectrometry to determine transition probabilities for over 700 lines of Nd II. This work is the largest-scale laboratory study to date of Nd II transition probabilities using modern methods. This improved data set is used to determine Nd abundances for the Sun and three metal-poor giant stars with neutron-capture enhancement: CS 22892-052, HD 115444, and BD +17°3248. In all four stars the line-to-line scatter is considerably reduced from earlier published results. The solar photospheric abundance is determined to be logɛ(Nd)=1.45+/-0.01(σ=0.05), which is in excellent agreement with meteoric data. The ratio of Nd/Eu is virtually identical in all three metal-poor Galactic halo stars. Furthermore, the newly determined stellar Nd abundances, in comparison with other heavy neutron-capture elements, are consistent with an r-process-only origin early in the history of the Galaxy. These more accurate Nd abundance determinations might help to constrain the predicted solar system r-process abundances, and suggest other elements for further neutron-capture abundance studies.

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