TRANSITION PROBABILITIES OF Sc I AND Sc II AND SCANDIUM ABUNDANCES INlevels at THE SUN, ARCTURUS, AND HD 84937

Published

March 27, 2019

Author(s)

James E. Lawler, FNU Hala, Chris Sneden, Gillian Nave, M. P. Wood, John J. Cowan

Abstract

New branching fraction (BF) measurements from 24 Fourier transform spectra calibrated using standard lamps and the Ar branching ratio (BR) method are reported. The BFs for 259 lines are converted to absolute atomic transition probabilities using published radiative lifetimes from laser induced fluorescence (LIF) measurements. Detailed comparison to earlier published BF measurements corroborates most of the earlier results with the exception of the yellow line multiplet of Sc II near 17500 cm-1. The BFs of lines in this multiplet are found to be systematically too small by several error bars in earlier research. These new lab data on Sc as well as recent hyperfine structure studies are applied to determine the abundance of scandium in the Sun, Arcturus, and HD 84937. General agreement is found with previous scandium abundance determinations in these stars. New consideration of scandium in metal-poor stars confirms that Sc abundances are correlated with Ti and V abundances.

Citation

Astrophysical Journal

Volume

241

Issue

2

Pub Type

Journals

Download Paper

https://doi.org/10.3847/1538-4365/ab08ef

Local Download

Keywords

Atomic data, Transition probability, Sun: abundances, Arcturus, abundances, Stars, individual(HD 84937)

Citation

Lawler, J. , Hala, F. , Sneden, C. , Nave, G. , Wood, M. and Cowan, J. (2019), TRANSITION PROBABILITIES OF Sc I AND Sc II AND SCANDIUM ABUNDANCES INlevels at THE SUN, ARCTURUS, AND HD 84937, Astrophysical Journal, [online], https://doi.org/10.3847/1538-4365/ab08ef, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=927269 (Accessed October 14, 2025)