Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Surface magnetic fields on two accreting T Tauri stars: CV Cha and CR
  Cha   We have produced brightness and magnetic field maps of the surfaces of CV Cha
and CR Cha: two actively accreting G and K-type T Tauri stars in the Chamaeleon
I star-forming cloud with ages of 3-5 Myr. Our magnetic field maps show
evidence for strong, complex multi-polar fields similar to those obtained for
young rapidly rotating main sequence stars. Brightness maps indicate the
presence of dark polar caps and low latitude spots -- these brightness maps are
very similar to those obtained for other pre-main sequence and rapidly rotating
main sequence stars.
  Only two other classical T Tauri stars have been studied using similar
techniques so far: V2129 Oph and BP Tau. CV Cha and CR Cha show magnetic field
patterns that are significantly more complex than those recovered for BP Tau, a
fully convective T Tauri star.
  We discuss possible reasons for this difference and suggest that the
complexity of the stellar magnetic field is related to the convection zone;
with more complex fields being found in T Tauri stars with radiative cores
(V2129 Oph, CV Cha and CR Cha). However, it is clearly necessary to conduct
magnetic field studies of T Tauri star systems, exploring a wide range of
stellar parameters in order to establish how they affect magnetic field
generation, and thus how these magnetic fields are likely to affect the
evolution of T Tauri star systems as they approach the main sequence.

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The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
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The categories of this paper are: quant-ph
2
The categories of this paper are: math
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The categories of this paper are: atom-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-lat
3
The categories of this paper are: physics
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The categories of this paper are: chao-dyn
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The categories of this paper are: solv-int
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The categories of this paper are: stat