Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photopolarimetric observations of the new eclipsing polar CTCV
  J1928-5001   We report photopolarimetric observations of a new eclipsing polar (AM
Herculis system) discovered in the Calan-Tololo survey. The photometry and
polarimetry are modulated on a period of ~101 minutes. Circular polarization
variations are seen from ~-8 to +12 per cent and from ~0 to ~5 per cent in the
red and blue parts of the optical spectrum, respectively. Two linearly
polarized pulses are detected at orbital phases coinciding with the reversals
in the circular polarization. This is consistent with a magnetic field strength
of ~20 MG for the white dwarf primary, where accretion takes place at two
regions. Both accretion regions are self-occulted by the white dwarf during
parts of the orbit. We estimate some of the system's parameters from its
eclipses, which we further refine by modelling the polarimetric observations.

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The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con
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The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
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The categories of this paper are: q-fin
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The categories of this paper are: cond-mat
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The categories of this paper are: econ
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The categories of this paper are: nucl-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: math
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The categories of this paper are: eess
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The categories of this paper are: physics
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-ex
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The categories of this paper are: math-ph