Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First Results from the CHARA Array. IV. The Interferometric Radii of
  Low-Mass Stars   We have measured the angular diameters of six M dwarfs with the CHARA Array,
a long-baseline optical interferometer located at Mount Wilson Observatory.
Spectral types range from M1.0 V to M3.0 V and linear radii from 0.38 to 0.69
Rsun. These results are consistent with the seven other M-dwarf radii
measurements from optical interferometry and with those for sixteen stars in
eclipsing binary systems. We compare all directly measured M dwarf radii to
model predictions and find that current models underestimate the true stellar
radii by up to 15-20%. The differences are small among the metal-poor stars but
become significantly larger with increasing metallicity. This suggests that
theoretical models for low mass stars may be missing some opacity source that
alters the computed stellar radii.

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The categories of this paper are: q-fin
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The categories of this paper are: q-alg
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The categories of this paper are: math-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: econ
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The categories of this paper are: nucl-th
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The categories of this paper are: solv-int
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The categories of this paper are: eess
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The categories of this paper are: hep-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: adap-org
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The categories of this paper are: hep-th
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The categories of this paper are: cond-mat
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The categories of this paper are: chem-ph
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The categories of this paper are: bayes-an