Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A 2dF survey of the Small Magellanic Cloud   We present a catalogue of new spectral types for hot, luminous stars in the
Small Magellanic Cloud. The catalogue contains 4161 objects, giving an order of
magnitude increase in the number of SMC stars with published spectroscopic
classifications. The targets are primarily B- and A-type stars (2862 and 853
objects respectively), with 1 Wolf-Rayet, 139 O-type, and 306 FG stars,
sampling the main sequence to ~mid-B. The selection and classification criteria
are described, and objects of particular interest are discussed, including
UV-selected targets from the Ultraviolet Imaging Telescope (UIT) experiment, Be
and B[e] stars, `anomalous A supergiants', and composite-spectrum systems. We
examine the incidence of Balmer-line emission, and the relationship between
H-gamma equivalent width and absolute magnitude for BA stars.

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The categories of this paper are: atom-ph
1
The categories of this paper are: cs
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The categories of this paper are: q-alg
23
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: bayes-an
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The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys
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The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
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The categories of this paper are: plasm-ph