Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The International Epsilon Aurigae Campaign 2009-2011. A description of
  the campaign and early results to May 2010   In early 2009, immediately following the end of the WR140 periastron campaign
(see these proceedings), I turned my telescope back to epsilon Aurigae in time
for the start of the eclipse. As well as being an interesting object in its own
right, the Pro-Am campaign being run on epsilon Aurigae during the current
eclipse is a good example of how amateur spectroscopists can make a useful
contribution. epsilon Aurigae is a naked eye magnitude 3 star and was first
noted to be variable by Johan Frisch in 1821. It was subsequently found to be
an eclipsing binary with a period of 27.1 years which undergoes an
approximately 2 year long flat-bottomed eclipse with approximately 0.8
magnitude drop in V.

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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: cond-mat
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The categories of this paper are: math-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-lat
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The categories of this paper are: plasm-ph
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The categories of this paper are: cs
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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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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: bayes-an
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The categories of this paper are: cmp-lg