Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Nature of the Companion to the Eclipsing Overtone Cepheid MACHO
  81.8997.87   The lightcurve of the Large Magellanic Cloud (LMC) variable star MACHO
81.8997.87 shows evidence for photometric variations due to both stellar
pulsation, with a 2.035 day period, and eclipsing behavior, with an 800.4 day
period. The primary star of the system has been identified as a first-overtone
Cepheid but the nature of the secondary star has not been determined. Here we
present multicolor BVI photometry of a primary eclipse of the system and fit a
model to the complete lightcurve to produce an updated set of elements. These
results are combined with 2MASS JHK photometry to give further insight into the
identity of the companion star. We find that the companion is most consistent
with a late-K or an early-M giant but also that there are a number of problems
with this interpretation. The prospects for future observations of this system
are also discussed.

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The categories of this paper are: atom-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: quant-ph
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The categories of this paper are: solv-int
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: q-alg
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The categories of this paper are: supr-con
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The categories of this paper are: nlin
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The categories of this paper are: hep-th
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The categories of this paper are: physics
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The categories of this paper are: stat
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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: comp-gas