Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The magnetosphere of the close accreting PMS binary V4046 Sgr   V4046 Sagittarii AB is a close short-period classical T Tauri binary. It is a
circularised and synchronised system accreting from a circumbinary disk. In
2009 it was observed as part of a coordinated program involving
near-simultaneous spectropolarimetric observations with ESPaDOnS at the
Canada-France-Hawai'i Telescope and high-resolution X-ray observations with
XMM-Newton. Magnetic maps of each star were derived from Zeeman-Doppler
imaging. After briefly highlighting the most significant observational
findings, we present a preliminary 3D model of the binary magnetosphere
constructed from the magnetic maps using a newly developed binary magnetic
field extrapolation code. The large-scale fields (the dipole components) of
both stars are highly tilted with respect to their rotation axes, and their
magnetic fields are linked.

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The categories of this paper are: solv-int
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The categories of this paper are: math
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-th
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: eess
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The categories of this paper are: hep-th
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The categories of this paper are: funct-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: stat
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The categories of this paper are: gr-qc
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The categories of this paper are: cmp-lg
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The categories of this paper are: cs
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The categories of this paper are: math-ph