Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spitzer Observations of GD 362 and Other Metal-Rich White Dwarfs   A {\em Spitzer} IRAC survey of 17 nearby metal-rich white dwarfs, nominally
DAZ stars, reveals excess emission from only 3 targets: G29-38, GD 362 and
G167-8. Observations of GD 362 with all three {\em Spitzer} instruments reveals
a warm ($\approx1000$ K) dust continuum, very strong silicate emission, and the
likely presence of cooler ($\approx500$ K) dust. While there is a general
similarity between the mid-infrared spectral energy distributions of G29-38 and
GD 362, the IRAC fluxes of G167-8 are so far unique among white dwarfs.
However, further observations of G167-8 are required before the measured excess
can be definitely associated with the white dwarf.

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The categories of this paper are: q-bio
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The categories of this paper are: chem-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: cs
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The categories of this paper are: ao-sci
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The categories of this paper are: cmp-lg
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The categories of this paper are: physics
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The categories of this paper are: math-ph
2
The categories of this paper are: math
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The categories of this paper are: cond-mat
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The categories of this paper are: adap-org
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The categories of this paper are: econ
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-th
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The categories of this paper are: nlin
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The categories of this paper are: mtrl-th