Enrichment of the r-process Element Europium in the Galactic Halo

Details Enrichment of the r-process Element Europium in the Galactic Halo Enrichment of the r-process Element Europium in the Galactic Halo

1998-12-03

arxiv.org/abs/astro-ph/9812067v1

Astronomy and Astrophysics

Astrophysics

5 pages (including 4 figures), LaTeX, uses aas2pp4.sty, accepted to ApJL

Scientific paper

10.1086/311829

We investigate the enrichment of europium, as a representative of r-process elements, in the Galactic halo. In present chemical evolution models, stars are assumed to be formed through shock processes by supernovae (SNe). The enrichment of the interstellar medium is calculated by a one-zone approach. The observed large dispersions in [Eu/Fe] for halo stars, converging with increasing metallicity, can be explained with our models. In addition, the mass range of SNe for the {\it r}-process site is constrained to be either stars of $8-10 M_\odot$ or $\gtrsim 30 M_\odot$.

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