Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: HST Observations of the Field Star Population in the Large Magellanic
  Cloud   We present $V$ and $I$ photometry, obtained with the Hubble Space Telescope,
for $\sim 15,800$ stars in a field in the inner disk of the Large Magellanic
Cloud. We confirm previous results indicating that an intense star formation
event, probably corresponding to the formation of the LMC disk, occurred a few
times $10^9$ years ago. We find a small but real difference between our field
and one further out in the disk observed by Gallagher et al (1996): either star
formation in the inner disk commenced slightly earlier, or the stars are
slightly more metal rich. We also find evidence for a later burst, around 1 Gyr
ago, which may correspond to the formation of the LMC bar. About 5% of the
stars in our field are substantially older than either burst, and are probably
members of an old disk or halo population with age $\sim 12$ Gyr.

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The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
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The categories of this paper are: q-alg
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The categories of this paper are: math-ph
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The categories of this paper are: funct-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: econ
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The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
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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: eess
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The categories of this paper are: physics
1
The categories of this paper are: cs
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The categories of this paper are: quant-ph
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The categories of this paper are: dg-ga