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Recent radiative lifetime measurements accurate to +/- 5% using laser-inducedfluorescence (LIF) on 43 even-parity and 15 odd-parity levels of Ce II havebeen combined with new branching fractions measured using a Fourier transformspectrometer (FTS) to determine transition probabilities for 921 lines of CeII. This improved laboratory data set has been used to determine a new solarphotospheric Ce abundance, log epsilon = 1.61 +/- 0.01 (sigma = 0.06 from 45lines), a value in excellent agreement with the recommended meteoriticabundance, log epsilon = 1.61 +/- 0.02. Revised Ce abundances have also beenderived for the r-process-rich metal-poor giant stars BD+17 3248, CS 22892-052,CS 31082-001, HD 115444 and HD 221170. Between 26 and 40 lines were used fordetermining the Ce abundance in these five stars, yielding a small statisticaluncertainty of 0.01 dex similar to the Solar result. The relative abundances inthe metal-poor stars of Ce and Eu, a nearly pure r-process element in the Sun,matches r-process only model predictions for Solar System material. Thisconsistent match with small scatter over a wide range of stellar metallicitieslends support to these predictions of elemental fractions. A companion paperincludes an interpretation of these new precision abundance results for Ce aswell as new abundance results and interpretations for Pr, Dy and Tm.

the astrophysical journal. supplement series/astrophysical journal. supplement series

Improved Laboratory Transition Probabilities for Ce II, Application to  the Cerium Abundances of the Sun and Five r-process Rich, Metal-Poor Stars,  and Rare Earth Lab Data