Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Detection of a sub-arcsecond dust shell around the Wolf-Rayet star WR
  112   A lunar occultation event of the Wolf-Rayet star WR 112 (type WC9) has been
observed simultaneously from two independent telescopes at lambda = 2.2microns,
allowing us to investigate this source with an angular resolution of approx
0.003 arc-seconds. We have detected a circumstellar dust envelope whose
brightness distribution can be approximately fitted by a gaussian with a FWHM
of approx 0.06 arc-seconds (approx 10^15 cm). We present and discuss the
reconstructed brightness profile, which shows an asymmetry in the radial dust
distribution. The derived dust grain temperature at the inner dust zone of
approx 1150 K is consistent with available model calculations. There is no
signature of the central star from our observations, providing a direct
confirmation that the circumstellar shell emission dominates over the
photospheric emission at 2.2microns as predicted by fits to the spectral energy
distribution. Further lunar occultation observations at different position
angles are essential to reconstruct the 2--D image of the dust shell around WR
112. The current series of lunar occultations of WR 112 will continue to the
end of 1999 and will be visible for all equatorial and southern latitude
observatories.

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The categories of this paper are: math
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The categories of this paper are: cs
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The categories of this paper are: quant-ph
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The categories of this paper are: eess
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The categories of this paper are: hep-lat
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The categories of this paper are: dg-ga
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-ex
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The categories of this paper are: chem-ph
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The categories of this paper are: math-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: q-alg
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The categories of this paper are: adap-org