Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optical polarization and near IR photometry of the proto-planetary
  nebula Hen 3-1475   We present BVRI CCD aperture polarization and near-infrared photometry of the
proto-planetary nebula Hen 3-1475. Its intrinsic polarization is high and shows
a strong spectral dependence. The position angles in all bands are
perpendicular to the axis of the observed bipolar structure. A Monte Carlo code
is used to model the intrinsic polarization of \hhe. Using disk dimensions and
other constraints suggested by previous works, we are able to reproduce the
observations with an optically thick disk composed by grains with a power-law
size distribution ranging from 0.06 to 0.22 um. We also reliably estimate the
foreground polarization from hundreds of stars contained in the CCD images. It
is parallel to the intrinsic polarization of Hen 3-1475. Possible implications
of this result are discussed. From IR observations, we estimate a interstellar
reddening, A(V), of about 3.2.

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The categories of this paper are: cmp-lg
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-th
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The categories of this paper are: math-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: q-fin
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The categories of this paper are: alg-geom
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The categories of this paper are: cs
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The categories of this paper are: math
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The categories of this paper are: gr-qc
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The categories of this paper are: adap-org
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The categories of this paper are: cond-mat
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The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
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The categories of this paper are: hep-lat
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The categories of this paper are: patt-sol