Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Circular Polarization of Circumstellar Water Masers: Magnetic Fields of
  AGB stars   We present circular polarization measurements of circumstellar water masers
around 2 Mira variables and 4 supergaint stars. Both an LTE and non-LTE method
are used to analyze the circular polarization and total intensity spectra and
to obtain the magnetic field strength. The non-LTE method is found to be able
to reproduce the observations best. Using this, we find fields from a few
hundred milliGauss up to a few Gauss, indicating a solar-type r^(-2) dependence
of the magnetic field on the distance, which leads to stellar surface magnetic
fields of up to several hundred Gauss. No linear polarization is detected to
less than 1.5%.

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The categories of this paper are: nlin
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The categories of this paper are: atom-ph
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The categories of this paper are: math-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-alg
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The categories of this paper are: quant-ph
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The categories of this paper are: solv-int
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The categories of this paper are: funct-an
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The categories of this paper are: alg-geom
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The categories of this paper are: chem-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: plasm-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org