Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thermonuclear Flame Spreading on Rapidly Spinning Neutron Stars:
  Indications of the Coriolis Force?   Millisecond period brightness oscillations during the intensity rise of
thermonuclear X-ray bursts are likely caused by an azimuthally asymmetric,
expanding burning region on the stellar surface. The time evolution of the
oscillation amplitude during the intensity rise encodes information on how the
thermonuclear flames spread across the stellar surface. This process depends on
properties of the accreted burning layer, surface fluid motions, and the
surface magnetic field structure, and thus can provide insight into these
stellar properties. We present two examples of bursts from different sources
that show a decrease in oscillation amplitude during the intensity rise. Using
theoretical modeling, we demonstrate that the observed amplitude evolution of
these bursts is not well described by a uniformly expanding circular burning
region. We further show that by including in our model the salient aspects of
the Coriolis force (as described by Spitkovsky, Levin, and Ushomirsky) we can
qualitatively reproduce the observed evolution curves. Our modeling shows that
the evolutionary structure of burst oscillation amplitude is sensitive to the
nature of flame spreading, while the actual amplitude values can be very useful
to constrain some source parameters.

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The categories of this paper are: cs
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The categories of this paper are: funct-an
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The categories of this paper are: math-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: stat
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The categories of this paper are: nucl-th
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The categories of this paper are: math
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The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
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The categories of this paper are: comp-gas
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The categories of this paper are: ao-sci
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The categories of this paper are: adap-org
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The categories of this paper are: econ
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The categories of this paper are: cond-mat
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The categories of this paper are: physics
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The categories of this paper are: hep-ex