Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mid-Cycle Observations of CR Boo and Estimation of the System's
  Parameters   We present observations (with NAO Rozhen and AS Vidojevica telescopes) of the
AM Canum Venaticorum (AM CVn) type binary star CR Bootis (CR Boo) in the UBV
bands. The data were obtained in two nights in July 2019, when the V band
brightness was in the range of 16.1-17.0 mag. In both nights, a variability for
a period of $25 (\pm 1)$ min and amplitude of about 0.2 magnitudes was visible.
These brightness variations are most likely indications of "humps". During our
observational time, they appear for a period similar to the CR Boo orbital
period. A possible reason of their origin is the phase rotation of the bright
spot, placed in the contact point of the infalling matter and the outer disc
edge. We estimated some of the parameters of the binary system, on the base of
the observational data.

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The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
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The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
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The categories of this paper are: stat
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The categories of this paper are: plasm-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: econ
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The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
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The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th