Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Periodicity in the Light Curve of P Cygni - Indication for a Binary
  Companion?   We use observations of the Luminous Blue Variable (LBV) P Cygni spanning
seven decades, along with signal processing methods, to identify a periodicity
in the stellar luminosity. We find a distinct period of $4.7 \pm 0.3$ years
together with shorter periods. The periodicity is a possible indication of a
binary companion passing in an eclipse-like event from the dense LBV wind, and
if so it is the first observational indication that P Cygni is a binary system.
This may support models that contribute giant LBV eruptions to interaction with
a binary companion. We discuss other interpretations for the periodicity as
well.

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The categories of this paper are: dg-ga
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The categories of this paper are: gr-qc
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The categories of this paper are: adap-org
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The categories of this paper are: q-fin
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: math
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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
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The categories of this paper are: stat
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The categories of this paper are: atom-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: comp-gas
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ph
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The categories of this paper are: cs