Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: AL 3 (BH 261): a new globular cluster in the Galaxy   AL~3 (BH 261), previously classified as a faint open cluster candidate, is
shown to be a new globular cluster in the Milky Way, by means of B, V and I
Color-Magnitude Diagrams. The main feature of AL~3 is a prominent blue extended
Horizontal Branch. Its Color-Magnitude Diagrams match those of the intermediate
metallicity cluster M~5. The cluster is projected in a rich bulge field, also
contaminated by the disk main sequence. The globular cluster is located in the
Galactic bulge at a distance from the Sun d$_{\odot}$ = 6.0$\pm$0.5 kpc. The
reddening is E(B-V)=0.36$\pm$0.03 and the metallicity is estimated to be [Fe/H]
$\approx$ -1.3$\pm$0.25. AL~3 is probably one of the least massive globular
clusters of the Galaxy.

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The categories of this paper are: hep-th
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The categories of this paper are: dg-ga
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The categories of this paper are: adap-org
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The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
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The categories of this paper are: eess
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The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
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The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-th
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The categories of this paper are: math
1
The categories of this paper are: cs
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The categories of this paper are: cmp-lg