Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A movie of a star: multi-epoch VLBA imaging of the SiO masers towards
  the Mira variable TX Cam   We describe an observing campaign using the Very Long Baseline Array (VLBA)
to monitor the time-evolution of the v=1, J=1-0 SiO maser emission towards the
Mira variable TX Cam. The data reported here cover the period 1997 May 24 to
1999 February 19, during which the SiO maser emission was imaged at
approximately bi-weekly intervals. The result is an animated movie at an
angular resolution of ~500 microarcsec, over a full pulsation period, of the
gas motions in the near circumstellar environment of this star, as traced by
the SiO maser emission. This paper serves to release the movie and is the first
in a series concerning the scientific results from this observing campaign. In
this paper, we discuss the global proper motion of the SiO maser emission as a
function of pulsation phase. We measure a dominant expansion mode between
optical phases $\phi \sim 0.7-1.5$ confirming ballistic deceleration, and
compare this to predictions from existing pulsation models for late-type,
evolved stars. Local infall and outflow motions are superimposed on the
dominant expansion mode, and non-radial local gas motions are also evident for
individual SiO maser components. The overall morphology and evolution of the
SiO emission deviates significantly from spherical symmetry, with important
implications for models of pulsation kinematics in the near-circumstellar
environments of Mira variables.

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The categories of this paper are: nlin
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The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
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The categories of this paper are: quant-ph
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The categories of this paper are: stat
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The categories of this paper are: adap-org
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The categories of this paper are: q-fin
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The categories of this paper are: physics
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The categories of this paper are: comp-gas
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-bio
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The categories of this paper are: alg-geom
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The categories of this paper are: atom-ph
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The categories of this paper are: cond-mat