Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Discovery of a Magnetic White Dwarf in the Symbiotic Binary Z Andromedae   We report the first result from our survey of rapid variability in symbiotic
binaries: the discovery of a persistent oscillation at P=1682.6 +- 0.6 s in the
optical emission from the prototype symbiotic, Z Andromedae. The oscillation
was detected on all 8 occasions on which the source was observed over a
timespan of nearly a year, making it the first such persistent periodic pulse
found in a symbiotic binary. The amplitude was typically 2 - 5 mmag, and it was
correlated with the optical brightness during a relatively small outburst of
the system. The most natural explanation is that the oscillation arises from
the rotation of an accreting, magnetic (B_S > 10^5 G) white dwarf. This
discovery constrains the outburst mechanisms, since the oscillation emission
region near the surface of the white dwarf was visible during the outburst.

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The categories of this paper are: atom-ph
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
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The categories of this paper are: funct-an
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The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
19
The categories of this paper are: eess