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Europium Isotope Ratios in s-Process Element-enhanced Metal-poor Stars: A new probe of the 151 Sm branching

Aoki, Wako; Ryan, Sean G; Iwamoto, Nobuyuki; Beers, Timothy C; Norris, John; Ando, Hiroyasu; Kajino, Toshitaka; Mathews, Grant; Fujimura, Harutoshi


We report on the first measurement of the Eu isotope fractions ( 151Eu and 153Eu) in s-process element-enhanced metal-poor stars. We use these ratios to investigate the 151Sm branching of s-process nucleosynthesis. The measurement was made by detailed study of Eu II lines that are significantly affected by hyperfine splitting and isotope shifts in spectra of the carbon-rich very metal poor stars LP 625-44 and CS 31062-050, observed with the Subaru Telescope High Dispersion Spectrograph. The...[Show more]

CollectionsANU Research Publications
Date published: 2003
Type: Journal article
Source: Astrophysical Journal, The
DOI: 10.1086/377681


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