Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The first polluted white dwarf from Gaia DR2: the cool DAZ
  GaiaJ1738-0826   We present the first metal-polluted single white dwarf star identified
through Gaia DR2. GaiaJ1738-0826, selected from color and absolute magnitude
cuts in the Gaia DR2 data, was discovered to have strong Ca~II absorption in
initial spectroscopic characterization at Lick Observatory. Notably,
GaiaJ1738-0826 resembles in many ways the first confirmed metal-polluted
hydrogen atmosphere white dwarf, the DAZ G74-7.

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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: ao-sci
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The categories of this paper are: q-alg
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ex
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The categories of this paper are: solv-int
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The categories of this paper are: math
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The categories of this paper are: supr-con
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: eess
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The categories of this paper are: patt-sol
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The categories of this paper are: nucl-th
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The categories of this paper are: nlin