Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Linear Spectropolarimetry and the Circumstellar Media of Young and
  Massive Stars   Linear spectropolarimetry is a powerful tool to probe circumstellar
structures on spatial scales that cannot yet be achieved through direct
imaging. In this review I discuss the role that emission-line polarimetry can
play in constraining geometrical and physical properties of a wide range of
circumstellar environments, varying from the accretion disks around pre-main
sequence T Tauri and Herbig Ae/Be stars, to the issue of stellar wind clumping,
and the aspherical outflows from the massive star progenitors of supernovae and
long gamma-ray bursts at low metallicity.

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The categories of this paper are: math-ph
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The categories of this paper are: adap-org
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The categories of this paper are: alg-geom
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The categories of this paper are: q-fin
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The categories of this paper are: cs
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The categories of this paper are: physics
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The categories of this paper are: atom-ph
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The categories of this paper are: q-alg
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The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: gr-qc
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The categories of this paper are: dg-ga
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The categories of this paper are: funct-an
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The categories of this paper are: solv-int