Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Near-infrared photometry of the intermediate age open clusters IC 166
  and NGC 7789   We present and discuss new photometric data obtained with an IR camera in the
J and K pass-bands for the intermediate age open clusters IC 166 (936 stars in
total) and NGC 7789 (1030 stars in total). Ic 166 is a poorly studied open
cluster for which no IR data was availabele previoulsy, while NGC 7789 is a
well studied open cluster. We show that IC 166 is of intermediate age (about
1.0 Gyr), whit a reddening E(V-K) =1.3 (corresponding to E(B-V) = 0.50) and a
true distance modulus (m-M)o = 13.25. These values are significantly different
from previous determinations. NGC 7789 is found to be a 1.4 Gyr old open
cluster. The metallicity derived with the method developed by Tiede et al
(1997) is found to be closer to the spectroscopic estimate than previous
photometric studies.

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The categories of this paper are: ao-sci
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The categories of this paper are: physics
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The categories of this paper are: nlin
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: supr-con
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The categories of this paper are: mtrl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: cond-mat
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The categories of this paper are: atom-ph
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The categories of this paper are: q-bio
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The categories of this paper are: stat
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The categories of this paper are: bayes-an
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The categories of this paper are: econ