Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Diffraction-limited Speckle-Masking Interferometry of the Red Supergiant
  VY CMa   We present the first diffraction-limited images of the mass-loss envelope of
the red supergiant star VY CMa. The two-dimensional optical and NIR images were
reconstructed from 3.6 m telescope speckle data using bispectrum speckle
interferometry. At the wavelengths ~0.8 \mum (RG 780 filter), 1.28 \mum, and
2.17 \mum the diffraction-limited resolutions of 46 mas, 73 mas, and 124 mas
were achieved. All images clearly show that the circumstellar envelope of VY
CMa is non-spherical. The RG 780, 1.28 \mum, and 2.17 mum FWHM Gauss fit
diameters are 67 mas * 83 mas, 80 mas * 116 mas and 138 mas * 205 mas,
respectively, or 100 AU * 125 AU, 120 AU * 174 AU and 207 AU * 308 AU (for a
distance of 1500 pc). We discuss several interpretations for the asymmetric
morphology. Combining recent results about the angular momentum evolution of
red supergiants and their pulsational properties, we suggest that VY CMa is an
immediate progenitor of IRC +10420, a post red supergiant during its
transformation into a Wolf-Rayet star.

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The categories of this paper are: gr-qc
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The categories of this paper are: cond-mat
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The categories of this paper are: funct-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-th
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The categories of this paper are: stat
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The categories of this paper are: q-bio
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: bayes-an
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The categories of this paper are: acc-phys
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The categories of this paper are: math
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The categories of this paper are: solv-int
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The categories of this paper are: patt-sol
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The categories of this paper are: cmp-lg
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The categories of this paper are: comp-gas