Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Historical light curve and search for previous outbursts of Nova KT
  Eridani (2009)   Context. Nova Eridani (2009) caught the eye of the nova community due to its
fast decline from maximum, which was initially missed, and its subsequent
development in the radio and X-ray wavelengths. This system also exhibits
properties similar to those of the much smaller class of recurrent novae;
themselves potential progenitors of Type Ia Supernovae. Aims. We aim to
determine the nature and physical parameters of the KT Eri progenitor system.
Methods. We searched the Harvard College Observatory archive plates for the
progenitor of KT Eri to determine the nature of the system, particularly the
evolutionary stage of the secondary.We used the data obtained to search for any
periodic signal and the derived luminosity to estimate a recurrence timescale.
Furthermore, by comparing the colours of the quiescent system on a
colour-magnitude diagram we may infer the nature of the secondary star.
Results. We identified the progenitor system of KT Eri and measured a quiescent
magnitude of < B >= 14.7 \pm 0.4. No previous outburst was found. However, we
suggest that if the nova is recurrent it should be on a timescale of centuries.
We find a periodicity at quiescence of 737 days which may arise from reflection
effects and/or eclipses in the central binary. The periodicity and the
quiescence magnitude of the system suggest that the secondary star is evolved
and likely in, or ascending, the Red Giant Branch. A second period is evident
at 376 days which has a sinusoidal like light curve. Furthermore, the outburst
amplitude of ~ 9 magnitudes is inconsistent with those expected for fast
classical novae (~ 17 magnitudes) which may lend further support for an evolved
secondary. (Abridged)

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The categories of this paper are: q-alg
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: ao-sci
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The categories of this paper are: cmp-lg
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The categories of this paper are: alg-geom
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The categories of this paper are: atom-ph
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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: chem-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: comp-gas
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The categories of this paper are: dg-ga
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The categories of this paper are: cs
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ph