Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High spatial resolution study of the inner environment around two young
  planetary nebulae   We present observations of the dusty emission from the young planetary
nebulae Hen2-113 and CPD-56 obtained with VLT/NACO, VLTI/MIDI. The central
stars of these two objects are Wolf-Rayet stars of the same spectral type
[WC10]. They share an impressive number of characteristics and are located at
similar distance, making the detection of any differences in their close
environment of great interest. Hen2-113 exhibits a clear ring-like structure of
about 0.4 arcsec in diameter, superimposed to a more diffuse environment
visible in L', M' and 8.7 micron bands. No clear core could be detected for
this object with MIDI through the N band. The dusty environment of CPD-568032
is much more compact, dominated by a bright, barely resolved, core whereas the
visible nebula exhibits an amazing complexity. From MIDI 8.7 micron acquisition
images (dominated by PAHs emission), the extension and geometry of the core
have been estimated and compared to the STIS/HST observations (De Marco et al.,
1997 and 2002). Moreover, high SNR fringes at low level have been detected with
projected baselines between 40 and 45 meters. This clear signal is interpreted
in terms of the bright inner rim of a dusty disk exposed to the flux from the
Wolf-Rayet star. The geometrical parameters of the N band flux distribution are
well constrained by means of simple geometrical models and a simple radiative
transfer model has been developed to extract the physical parameters of the
disk.

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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-th
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The categories of this paper are: eess
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The categories of this paper are: cond-mat
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The categories of this paper are: econ
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The categories of this paper are: hep-ph
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The categories of this paper are: q-fin
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The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: math-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: bayes-an
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The categories of this paper are: acc-phys