Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Supergiant Temperatures and Linear Radii from Near-Infrared
  Interferometry   We present angular diameters for 42 luminosity class I stars and 32
luminosity class II stars that have been interferometrically determined with
the Palomar Testbed Interferometer. Derived values of radius and effective
temperature are established for these objects, and an empirical calibration of
these parameters for supergiants will be presented as a functions of spectral
type and colors. For the effective temperature versus $(V-K)_0$ color, we find
an empirical calibration with a median deviation of $\Delta T = 70$K in the
range of $0.7 < (V-K)_0 < 5.1$ for LC I stars; for LC II, the median deviation
is $\Delta T = 120$K from $0.4 < (V-K)_0 < 4.3$. Effective temperature as a
function of spectral type is also calibrated from these data, but shows
significantly more scatter than the $T_{\rm EFF}$ versus $(V-K)_0$
relationship. No deviation of $T_{\rm EFF}$ versus spectral type is seen for
these high luminosity objects relative to luminosity class II giants. Directly
determined diameters range up to $400 R_\odot$, though are limited by poor
distance determinations, which dominate the error estimates. These temperature
and radii measures reflect a direct calibration of these parameters for
supergiants from empirical means.

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The categories of this paper are: hep-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-lat
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The categories of this paper are: q-alg
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The categories of this paper are: cmp-lg
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The categories of this paper are: nlin
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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: math
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The categories of this paper are: physics
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The categories of this paper are: bayes-an
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The categories of this paper are: cs
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The categories of this paper are: stat
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-fin