Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Detailed abundances of Red Giants in the Globular Cluster NGC~1851:
  C+N+O and the Origin of Multiple Populations   We present chemical abundance analysis of a sample of 15 red giant branch
(RGB) stars of the Globular Cluster NGC~1851 distributed along the two RGBs of
the (v, v-y) CMD. We determined abundances for C+N+O, Na, $\alpha$, iron-peak,
and s-elements. We found that the two RGB populations significantly differ in
their light (N,O,Na) and s-element content. On the other hand, they do not show
any significant difference in their $\alpha$ and iron-peak element content.
More importantly, the two RGB populations do not show any significant
difference in their total C+N+O content. Our results do not support previous
hypotheses suggesting that the origin of the two RGBs and the two subgiant
branches of the cluster is related to a different content of either $\alpha$
(including Ca) or iron-peak elements, or C+N+O abundance, due to a second
generation polluted by SNeII.

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The categories of this paper are: cond-mat
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The categories of this paper are: nucl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: comp-gas
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The categories of this paper are: eess
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The categories of this paper are: chem-ph
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The categories of this paper are: econ
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The categories of this paper are: patt-sol
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The categories of this paper are: ao-sci
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The categories of this paper are: funct-an
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The categories of this paper are: hep-th