Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quiescent observations of the WZ Sge type dwarf nova PQ Andromedae   We have obtained time series optical spectra of the cataclysmic variable PQ
And in quiescence. The spectra show a white dwarf continuum with narrow Balmer
emission superimposed over strong Balmer absorption. The emission lines have
blue and red components whose strength changes with time. An analysis of the
H$\alpha$ emission line implies a short orbital period below the period gap.
Given its lack of accretion disk features, its large and infrequent outbursts,
and an orbital period below the period gap, PQ And is probably a low accretion
rate object similar to WZ Sge. In addition, white dwarf model fits imply that
PQ And is an excellent ZZ Cet candidate.

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The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
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The categories of this paper are: chao-dyn
2
The categories of this paper are: math
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
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The categories of this paper are: hep-lat
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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: acc-phys
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The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an