Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Resynchronization of the Asynchronous Polar CD Ind   CD Ind is one of only four confirmed asynchronous polars (APs). APs are
strongly magnetic cataclysmic variables of the AM Herculis subclass with the
characteristic that their white dwarfs rotate a few per cent out of synchronism
with their binary orbit. Theory suggests that nova eruptions disrupt previously
synchronized states. Following the eruption, the system is expected to rapidly
resynchronize over a timescale of centuries. The other three asynchronous
polars - V1432 Aql, BY Cam and V1500 Cyg - have resynchronization time
estimates ranging from 100 to more than 3500 years, with all but one being less
than 1200 years. We report on the analysis of over 46000 observations of CD Ind
taken between 2007 and 2016, combined with previous observations from 1996, and
estimate a CD Ind resynchronization time of 6400 +/- 800 years. We also
estimate an orbital period of 110.820(1) minutes and a current (2016.4) white
dwarf spin period of 109.6564(1) minutes.

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The categories of this paper are: funct-an
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The categories of this paper are: comp-gas
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The categories of this paper are: math-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: econ
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The categories of this paper are: mtrl-th
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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-ex
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The categories of this paper are: nlin
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The categories of this paper are: hep-lat
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The categories of this paper are: adap-org
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The categories of this paper are: chem-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
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The categories of this paper are: supr-con
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The categories of this paper are: alg-geom