Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The hunt for old novae   We inform on the progress of our on-going project to identify and classify
old classical novae, using deep UBVR photometry and subsequent spectroscopy for
a proper candidate confirmation, and time-resolved observations in order to
find the orbital period and other physical properties of the identified old
novae. This way, we have already increased the number of confirmed southern and
equatorial post-novae from 33 to 50, and determined new orbital periods of
eight objects. As an example, we summarise the results on V728 Sco (Nova Sco
1862) which we found to be an eclipsing system with a 3.32 h orbital period,
displaying high and low states similar to dwarf-nova outbursts. Analysis of the
low-state eclipse indicates the presence of a small hot inner disc around the
white dwarf component.

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The categories of this paper are: physics
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-th
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The categories of this paper are: solv-int
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The categories of this paper are: cond-mat
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The categories of this paper are: q-fin
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The categories of this paper are: q-alg
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The categories of this paper are: eess
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The categories of this paper are: supr-con
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The categories of this paper are: bayes-an
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The categories of this paper are: nlin
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The categories of this paper are: hep-lat
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The categories of this paper are: stat
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The categories of this paper are: dg-ga
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-ph