Journal
ASTROPHYSICAL JOURNAL
Volume 643, Issue 2, Pages 1180-1189Publisher
IOP PUBLISHING LTD
DOI: 10.1086/503195
Keywords
nuclear reactions, nucleosynthesis, abundances; stars : individual ( HD 122563); stars : Population II
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Funding
- Science and Technology Facilities Council [PP/D000920/1] Funding Source: researchfish
- STFC [PP/D000920/1] Funding Source: UKRI
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We obtained high-resolution, high signal-to-noise ratio (S/N) spectroscopy for the very metal poor star HD 122563 with the Subaru Telescope High Dispersion Spectrograph. Previous studies have shown that this object has excesses of light neutron-capture elements, while its abundances of heavy ones are very low. In our spectrum, which covers 3070 - 4780 angstrom of this object, 19 neutron-capture elements have been detected, 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. The abundance pattern shows a gradually decreasing trend, as a function of atomic number, from Sr to Yb, which is quite different from those in stars with excesses of r-process elements. This abundance pattern of neutron-capture elements provides new strong constraints on the models of nucleosynthesis responsible for the very metal poor stars with excesses of light neutron-capture elements but without enhancement of heavy ones.
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