Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Discovery of optical flickering from the symbiotic star EF Aquilae   We report optical CCD photometry of the recently identified symbiotic star EF
Aql. Our observations in Johnson V and B bands clearly show the presence of
stochastic light variations with an amplitude of about 0.2 mag on a time scale
of minutes. The observations point toward a white dwarf (WD) as the hot
component in the system. It is the 11-th object among more than 200 symbiotic
stars known with detected optical flickering. Estimates of the mass accretion
rate onto the WD and the mass loss rate in the wind of the Mira secondary star
lead to the conclusion that less than 1 per cent of the wind is captured by the
WD. Eight further candidates for the detection of flickering in similar systems
are suggested.

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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: q-alg
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The categories of this paper are: stat
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The categories of this paper are: physics
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The categories of this paper are: patt-sol
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: econ
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The categories of this paper are: bayes-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: adap-org
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The categories of this paper are: chao-dyn