Detection of low Eu abundances in extremely metal-poor stars and the origin of r-process elements

Details Detection of low Eu abundances in extremely metal-poor stars and the origin of r-process elements Detection of low Eu abundances in extremely metal-poor stars and the origin of r-process elements

2003-06-19

arxiv.org/abs/astro-ph/0306388v2

Astrophys.J.600:L47-L50,2003

Astronomy and Astrophysics

Astrophysics

7 pages, 2 figures, accepted for publication in the Astrophysical Journal Letters

Scientific paper

10.1086/381496

We report abundance analyses of three extremely metal-poor stars with [Fe/H] $\lesssim -3$, using the Subaru High Dispersion Spectrograph (HDS). All are found to have sub-solar values of [Eu/Fe]. Comparison with our chemical evolution model of the Galactic halo implies the dominant source of Eu to be the low-mass end of the supernova mass range. Future studies of stars with low Eu abundances will be important to determine the r-process site.

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