Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cycle times of early M dwarf stars: mean field models versus
  observations   Observations of early-type M stars suggest that there are two characteristic
cycle times, one of order one year for fast rotators ($P_{\rm rot} < 1$ day)
and another of order four years for slower rotators. For a sample of
fast-rotating stars, the equator-to-pole differences of the rotation rates up
to 0.03 rad d$^{-1}$ are also known from Kepler data. These findings are
well-reproduced by mean field models. These models predict amplitudes of the
meridional flow, from which the travel time from pole to equator at the base of
the convection zone of early-type M stars can be calculated. As these travel
times always exceed the observed cycle times, our findings do not support the
flux transport dynamo.

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The categories of this paper are: comp-gas
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The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
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The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys
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The categories of this paper are: plasm-ph
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The categories of this paper are: stat
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The categories of this paper are: adap-org