Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radial velocities and metallicities of red giant stars in the old open
  cluster NGC 7762   We present and discuss radial velocity and the very first metallicity
measurements for nine evolved stars in the poorly known old open cluster NGC
7762. We isolated eight radial velocity cluster members and one interloper.
Radial velocities are in good agreement with previous studies. NGC 7762 turns
out to be of solar metallicity within the uncertainties ([Fe/H]=0.04$\pm$0.12).
For this metallicity, the cluster age is 2.5$\pm$0.2 Gyr, and falls in a age
range where only a few old open clusters are known. With respect to previous
studies, we find a larger distance, implying the cluster to be located at
900$^{+70}_{-50}$ pc from the Sun. For most of the elements we measure
solar-scaled abundance ratios. We searched the literature for open clusters of
similar age in the solar vicinity and found that NGC 7762 can be considered a
twin of Ruprecht 147, a similar age cluster located at only 300 pc from the
Sun. In fact, beside age, also metallicity and abundance ratios are very close
to Ruprecht 147 values within the observational uncertainties.

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The categories of this paper are: gr-qc
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The categories of this paper are: cond-mat
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The categories of this paper are: physics
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The categories of this paper are: plasm-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: q-alg
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The categories of this paper are: supr-con
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The categories of this paper are: hep-lat
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The categories of this paper are: funct-an
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The categories of this paper are: bayes-an
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The categories of this paper are: econ
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: solv-int
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The categories of this paper are: math