TY - JOUR
T1 - Subaru/HDS studies of r-process elements in metal-poor stars from near-UV spectra
AU - Honda, S.
AU - Aoki, W.
AU - Ishimaru, Y.
AU - Wanajo, S.
AU - Ryan, S. G.
AU - Kajino, T.
AU - Ando, H.
AU - Beers, T. C.
PY - 2005
Y1 - 2005
N2 - We present detailed abundance measurements of neutron-capture elements for the two very metal-poor stars HD 6268 and HD 122563, based on very high-quality, near-UV spectra (S/N > 140 @3100A) using Subaru/HDS. Abundances have been obtained for a total of 26 and 19 neutron-capture elements in these two stars, respectively, including Nb, Mo, Ru, Pd, Ag, Pr, and Sm. We have confirmed that the abundance pattern of neutron-capture elements in HD 6268 agrees very well with that of previously known r-process-enhanced stars. In contrast, the elemental abundances of HD 122563 are found to steeply decrease with increasing atomic number than those of HD 6268, and are much lower than than the r-process pattern in solar-system material. This result provides a new, strong constraint on models of the nucleosynthetic process that has provided light neutron-capture elements in the very early Galaxy.
AB - We present detailed abundance measurements of neutron-capture elements for the two very metal-poor stars HD 6268 and HD 122563, based on very high-quality, near-UV spectra (S/N > 140 @3100A) using Subaru/HDS. Abundances have been obtained for a total of 26 and 19 neutron-capture elements in these two stars, respectively, including Nb, Mo, Ru, Pd, Ag, Pr, and Sm. We have confirmed that the abundance pattern of neutron-capture elements in HD 6268 agrees very well with that of previously known r-process-enhanced stars. In contrast, the elemental abundances of HD 122563 are found to steeply decrease with increasing atomic number than those of HD 6268, and are much lower than than the r-process pattern in solar-system material. This result provides a new, strong constraint on models of the nucleosynthetic process that has provided light neutron-capture elements in the very early Galaxy.
KW - Abundances
KW - Nuclear reactions
KW - Nucleosynthesis
KW - Stars: Abundances
KW - Ultraviolet: Stars
UR - https://www.scopus.com/pages/publications/63549103263
U2 - 10.1017/S1743921305006162
DO - 10.1017/S1743921305006162
M3 - 文章
AN - SCOPUS:63549103263
SN - 1743-9213
VL - 1
SP - 429
EP - 434
JO - Proceedings of the International Astronomical Union
JF - Proceedings of the International Astronomical Union
IS - S228
ER -