Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Age and Metallicity Relation of Omega Centauri   We present a metallicity distribution based on photometry and spectra for 442
omega Cen cluster members that lie at the main sequence turnoff region of the
color-magnitude diagram. This distribution is similar to that found for the red
giant branch. The distribution shows a sharp rise to a mean of [Fe/H] = -1.7
with a long tail to higher metallicities. Ages have then been determined for
the stars using theoretical isochrones enabling the construction of an
age-metallicity diagram. Interpretation of this diagram is complicated by the
correlation of the errors in the metallicities and ages. Nevertheless, after
extensive Monte-Carlo simulations, we conclude that our data show that the
formation of the cluster took place over an extended period of time: the most
metal-rich stars in our sample ([Fe/H] ~ -0.6) are younger by 2-4 Gyrs than the
most metal-poor population.

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The categories of this paper are: math
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The categories of this paper are: cs
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The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: atom-ph
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The categories of this paper are: solv-int
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The categories of this paper are: cmp-lg
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: stat
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The categories of this paper are: eess
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ph
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The categories of this paper are: nlin