Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High resolution infrared spectroscopy of the old open cluster NGC6791   We report abundance analysis for 6 M giant members of the old open cluster
NGC6791, based on infrared spectroscopy (1.5-1.8 micron) at R=25,000, using the
NIRSPEC spectrograph at the Keck II telescope. We find the iron abundance
<[Fe/H]>= +0.35 +/- 0.02$, confirming the super solar metallicity of this
cluster derived from optical medium-high resolution spectroscopy. We also
measure C, O and other alpha element abundances, finding roughly solar
[alpha/Fe] and <[C/Fe]> = -0.35. Our approach constrains [O/Fe] especially
well, based on the measurement of a number of OH lines near 1.6micron; we find
[O/Fe]=-0.07 +/-0.03. The Solar alpha enhancement is in contrast to the
composition of similar stars in the Galactic bulge. We also find low
12C/13C~10, confirming the presence of extra-mixing processes during the red
giant phase of evolution, up to super solar metallicities.

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The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
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The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
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The categories of this paper are: eess
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: funct-an
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The categories of this paper are: adap-org
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The categories of this paper are: q-alg