Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: AE Aquarii: how CVs descend from supersoft binaries   AE Aquarii is a propeller system. It has the shortest spin period among
cataclysmic variables, and this is increasing on a 10^7 yr timescale. Its UV
spectrum shows very strong carbon depletion vs nitrogen and its secondary mass
indicates a star far from the zero-age main sequence. We show that these
properties strongly suggest that AE Aqr has descended from a supersoft X-ray
binary. We calculate the evolution of systems descending through this channel,
and show that many of them end as AM CVn systems. The short spindown timescale
of AE Aqr requires a high birthrate for such systems, implying that a
substantial fraction of cataclysmic variables must have formed in this way. A
simple estimate suggests that this fraction could be of order one-third of
current CVs. We emphasize the importance of measurements of the C/N abundance
ratio in CVs, particularly via the CIV1550 / NV1238 ratio, in determining how
large the observed fraction is.

31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: plasm-ph
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The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th