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Recent radiative lifetime measurements accurate to +/- 5% (Stockett et al.2007, J. Phys. B 40, 4529) using laser-induced fluorescence (LIF) on 8even-parity and 62 odd-parity levels of Er II have been combined with newbranching fractions measured using a Fourier transform spectrometer (FTS) todetermine transition probabilities for 418 lines of Er II. This work moves ErII onto the growing list of rare earth spectra with extensive and accuratemodern transition probability measurements using LIF plus FTS data. Thisimproved laboratory data set has been used to determine a new solarphotospheric Er abundance, log epsilon = 0.96 +/- 0.03 (sigma = 0.06 from 8lines), a value in excellent agreement with the recommended meteoric abundance,log epsilon = 0.95 +/- 0.03. Revised Er abundances have also been derived forthe r-process-rich metal-poor giant stars CS 22892-052, BD+17 3248, HD 221170,HD 115444, and CS 31082-001. For these five stars the average Er/Eu abundanceratio, <log epsilon (Er/Eu)> = 0.42, is in very good agreement with thesolar-system r-process ratio. This study has further strengthened the findingthat r-process nucleosynthesis in the early Galaxy which enriched thesemetal-poor stars yielded a very similar pattern to the r-process which enrichedlater stars including the Sun.

Improved Laboratory Transition Probabilities for Er II and Applications to the Erbium Abundances of the Sun and Five r-Process Rich, Metal-Poor Stars