Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: SDSS J142625.71+575218.3: The First Pulsating White Dwarf with a Large
  Detectable Magnetic Field   We report the discovery of a strong magnetic field in the unique pulsating
carbon-atmosphere white dwarf SDSS J142625.71+575218.3. From spectra gathered
at the MMT and Keck telescopes, we infer a surface field of B_s ~1.2 MG, based
on obvious Zeeman components seen in several carbon lines. We also detect the
presence of a Zeeman-splitted He I 4471 line, which is an indicator of the
presence of a non-negligible amount of helium in the atmosphere of this Hot DQ
star. This is important for understanding its pulsations, as nonadabatic theory
reveals that some helium must be present in the envelope mixture for pulsation
modes to be excited in the range of effective temperature where the target star
is found. Out of nearly 200 pulsating white dwarfs known today, this is the
first example of a star with a large detectable magnetic field. We suggest that
SDSS J142625.71+575218.3 is the white dwarf equivalent of a roAp star.

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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
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The categories of this paper are: adap-org
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The categories of this paper are: chao-dyn
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The categories of this paper are: cmp-lg
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-fin
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The categories of this paper are: econ
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The categories of this paper are: acc-phys
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The categories of this paper are: comp-gas
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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: nlin
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-lat