Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A universal relation for the propeller mechanisms in magnetic rotating
  stars at different scales   Accretion of matter onto a magnetic, rotating object can be strongly affected
by the interaction with its magnetic field. This occurs in a variety of
astrophysical settings involving young stellar objects, white dwarfs, and
neutron stars. As matter is endowed with angular momentum, its inflow toward
the star is often mediated by an accretion disc. The pressure of matter and
that originating from the stellar magnetic field balance at the magnetospheric
radius: at smaller distances the motion of matter is dominated by the magnetic
field, and funnelling towards the magnetic poles ensues. However, if the star,
and thus its magnetosphere, is fast spinning, most of the inflowing matter will
be halted at the magnetospheric radius by centrifugal forces, resulting in a
characteristic reduction of the accretion luminosity. The onset of this
mechanism, called the propeller, has been widely adopted to interpret a
distinctive knee in the decaying phase of the light curve of several
transiently accreting X-ray pulsar systems. By comparing the observed
luminosity at the knee for different classes of objects with the value
predicted by accretion theory on the basis of the independently measured
magnetic field, spin-period, mass, and radius of the star, we disclose here a
general relation for the onset of the propeller which spans about eight orders
of magnitude in spin period and ten in magnetic moment. The
parameter-dependence and normalisation constant that we determine are in
agreement with basic accretion theory.

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The categories of this paper are: cmp-lg
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The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
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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: hep-ex
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The categories of this paper are: chem-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: comp-gas
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The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org
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The categories of this paper are: patt-sol
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The categories of this paper are: nlin
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph