Open AccessNeutron‐Capture Elements in the Very Metal Poor Star HD 122563
Author(s) -
Satoshi Honda,
Wako Aoki,
Yuhri Ishimaru,
Shinya Wanajo,
Sean G. Ryan
Publication year - 2006
Publication title -
the astrophysical journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.376
H-Index - 489
eISSN - 1538-4357
pISSN - 0004-637X
DOI - 10.1086/503195
Subject(s) - physics , nucleosynthesis , r process , astrophysics , stars , spectrograph , neutron star , neutron capture , abundance (ecology) , subaru telescope , metal , neutron , spectral line , astronomy , nuclear physics , chemistry , organic chemistry , fishery , biology
We obtained high resolution, high S/N spectroscopy for the very metal-poorstar HD122563 with the Subaru Telescope High Dispersion Spectrograph. Previousstudies have shown that this object has excesses of light neutron-captureelements, while its abundances of heavy ones are very low. In our spectrumcovering 3070 - 4780 A of this object, 19 neutron-capture elements have beendetected, including seven for the first time in this star (Nb, Mo, Ru, Pd, Ag,Pr, and Sm). Upper limits are given for five other elements including Th. Theabundance pattern shows a gradually decreasing trend, as a function of atomicnumber, from Sr to Yb, which is quite different from those in stars withexcesses of r-process elements. This abundance pattern of neutron-captureelements provides new strong constraints on the models of nucleosynthesisresponsible for the very metal-poor stars with excesses of lightneutron-capture elements but without enhancement of heavy ones.Comment: 29 pages, 7 figures, Accepted for publication in Ap
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