Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Neutron-capture elements in the very metal-poor star HD122563   We obtained high resolution, high S/N spectroscopy for the very metal-poor
star HD122563 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
covering 3070 - 4780 A 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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The categories of this paper are: q-alg
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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: acc-phys
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-th
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The categories of this paper are: econ
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The categories of this paper are: q-fin
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The categories of this paper are: bayes-an
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The categories of this paper are: math-ph
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The categories of this paper are: solv-int
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The categories of this paper are: nlin
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The categories of this paper are: cmp-lg
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The categories of this paper are: atom-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: stat