Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Search for Variability in the Spectral Line Shapes of tau Bootis: Does
  this Star Really Have a Planet?   An analysis is made of the spectral line shapes of tau Bootis using high
resolution (0.026 A) and high signal-to-noise (S/N~400) data in an effort to
confirm the planet hypothesis for this star. Changes in the line shape are
quantified using spectral line bisectors and line residuals. We detect no
variations in either of these quantities above the level of the noise in the
data. One spectral line, Fe I 6213 A, does show a hint of sinusoidal variations
in the bisector velocity span when phased to the radial velocity period of 3.3
days, but this is not seen in the bisectors for two other lines, nor in the
line residuals. Comparisons of the data to the bisector and residual variations
expected for nonradial pulsations indicate that we can exclude those sectoral
nonradial modes having m>2 and all sectoral modes with k>1, where k is the
ratio of the horizontal to vertical velocities for the pulsations. The lack of
line shape variability and the 469 m/s radial velocity amplitude is still
consistent with nonradial sectoral modes m=1, and possibly m=2, but with k~1,
which is at least 3 orders of magnitude less than the predicted value given the
3.3 day period of tau Bootis. Such low values of k can probably be excluded
given the lack of photometric variations for this star. Although the
measurements presented here do not prove, without any doubt, that tau Boo has a
planetary companion, they do add significantly to the increasing body of
evidence in favor of this hypothesis.

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The categories of this paper are: solv-int
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The categories of this paper are: gr-qc
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The categories of this paper are: q-fin
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The categories of this paper are: hep-lat
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The categories of this paper are: alg-geom
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The categories of this paper are: plasm-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: ao-sci
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The categories of this paper are: math-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: q-bio
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The categories of this paper are: funct-an
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The categories of this paper are: physics
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The categories of this paper are: nlin
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The categories of this paper are: atom-ph
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The categories of this paper are: dg-ga