Gd Transition Probabilities and Abundances
| dc.creator | Hartog, E. A. Den | |
| dc.creator | Lawler, J. E. | |
| dc.creator | Sneden, C. | |
| dc.creator | Cowan, J. J. | |
| dc.date | 2006-09-18 | |
| dc.date.accessioned | 2026-07-07T07:23:16Z | |
| dc.date.available | 2026-07-07T07:23:16Z | |
| dc.description | Radiative lifetimes, accurate to +/- 5%, have been measured for 49 even-parity and 14 odd-parity levels of Gd II using laser-induced fluorescence. The lifetimes are combined with branching fractions measured using Fourier transform spectrometry to determine transition probabilities for 611 lines of Gd II. This work is the largest-scale laboratory study to date of Gd II transition probabilities and the first using a high performance Fourier transform spectrometer. This improved data set has been used to determine a new solar photospheric Gd abundance, log epsilon = 1.11 +/- 0.03. Revised Gd abundances have also been derived for the r-process-rich metal-poor giant stars CS 22892-052, BD+17 3248, and HD 115444. The resulting Gd/Eu abundance ratios are in very good agreement with the solar-system r-process ratio. We have employed the increasingly accurate stellar abundance determinations, resulting in large part from the more precise laboratory atomic data, to predict directly the Solar System r-process elemental abundances for Gd, Sm, Ho and Nd. Our analysis of the stellar data suggests slightly higher recommended values for the r-process contribution and total Solar System values, consistent with the photospheric determinations, for the elements for Gd, Sm, and Ho. | |
| dc.description | 24 pages, 5 figures, 6 tables; to appear in the Astrophysical Journal Supplement | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0609487 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0609487 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/115917 | |
| dc.subject | Astrophysics | |
| dc.title | Gd Transition Probabilities and Abundances | |
| dc.type | text |