Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: V2487 Ophiuchi: A strong candidate for a recurrent nova and a progenitor
  of Type Ia supernova   The light curve of the 1998 outburst of V2487 Ophiuchi (Nova Oph 1998) shows
a very rapid decline (t_3 ~ 9 day) and a mid-plateau phase from 10 to 30 days
after the optical maximum, which are characteristics common to the U Sco
subclass of the recurrent novae. We have numerically reproduced light curves of
the 1998 outburst based on a thermonuclear runaway model with optically thick
winds. The results show that the mass of the white dwarf (WD) is as massive as
1.35 \pm 0.01 M_\sun; the envelope mass of the WD at the optical maximum is ~ 6
x 10^{-6} M_\sun; the hydrogen content of the WD envelope is as low as X ~ 0.1
by mass weight. The mass transfer rate in quiescence is roughly estimated to be
\~ 1.5 x 10^{-7} M_\sun yr^{-1} and, therefore, that the recurrence period of
nova outbursts is about 40 yr. Since the WD mass may be now growing at a rate
of ~ 2 x 10^{-8} M_\sun yr^{-1}, V2487 Oph is a strong candidate for a
progenitor of a Type Ia supernova.

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The categories of this paper are: hep-lat
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The categories of this paper are: patt-sol
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The categories of this paper are: q-fin
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The categories of this paper are: nlin
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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: plasm-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-th
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The categories of this paper are: quant-ph
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The categories of this paper are: eess
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The categories of this paper are: bayes-an
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The categories of this paper are: math-ph
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The categories of this paper are: econ
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The categories of this paper are: acc-phys