Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The activity of the symbiotic binary Z Andromedae and its latest
  outburst   Z Andromedae is a prototype of classical symbiotic variable stars. It is
characterized by alternating of quiescent and active stages, the later ones are
accompanied by changes in both photometry and spectral characteristics of this
object. The current activity of Z And began in 2000, and the last outburst was
recorded at the turn of the years 2017 and 2018. An important source of
information about the behaviour of this symbiotic binary during the ongoing
active stage is photometric and spectroscopic observations obtained with small
telescopes by amateur astronomers. In this paper, we present the results of
analysis of these observations, with an emphasis on the significant similarity
of the last outburst of Z And with the previous ones, during which jets from
this symbiotic system were observed. The presented results point to the
importance of long-term monitoring of symbiotic binaries.

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The categories of this paper are: hep-ex
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The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
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The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
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The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org
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The categories of this paper are: econ
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
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The categories of this paper are: patt-sol
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The categories of this paper are: eess
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-th