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

被引：59

作者：

Ishimaru, Y

Wanajo, S

Aoki, W

Ryan, SG

机构：

[1] Ochanomizu Univ, Dept Phys, Bunkyo Ku, Tokyo 1128610, Japan

[2] Ochanomizu Univ, Grad Sch Humanities & Sci, Bunkyo Ku, Tokyo 1128610, Japan

[3] Sophia Univ, Dept Phys, Chiyoda Ku, Tokyo 1028554, Japan

[4] Natl Astron Observ, Tokyo 1818588, Japan

[5] Open Univ, Dept Phys & Astron, Milton Keynes MK7 6AA, Bucks, England

来源：

ASTROPHYSICAL JOURNAL | 2004年 / 600卷 / 01期

关键词：

Galaxy : evolution; Galaxy : halo; nuclear reactions; nucleosynthesis; abundances stars : abundances; stars : Population II; supernovae : general;

D O I：

10.1086/381496

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report abundance analyses of three extremely metal-poor stars with [Fe/H] less than or similar to -3 using the Subaru High Dispersion Spectrograph. All are found to have subsolar 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.

引用

页码：L47 / L50

页数：4

共 40 条

[1]

[Anonymous], APJL L

[2] Neutron capture in low-mass asymptotic giant branch stars:: Cross sections and abundance signatures [J].