Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relativistic effects on coronal ejection in variable X-ray sources   Optically thin coronae around neutron stars suffering an X-ray burst can be
ejected as a result of rapid increase in stellar luminosity. In general
relativity (GR), radiation pressure from the central luminous star counteracts
gravitational attraction more strongly than in Newtonian physics. However,
motion near the neutron star is very effectively impeded by the radiation
field. We discuss coronal ejection in a general relativistic calculation of the
motion of a test particle in a spherically symmetric radiation field. At every
radial distance from the star larger than that of the ISCO, and any initial
luminosity of the star, there exists a luminosity change which leads to coronal
ejection. The luminosity required to eject from the system the inner parts of
the optically thin neutron-star corona is very high in the presence of
radiation drag and always close to the Eddington luminosity. Outer parts of the
corona, at a distance of ~20 $R_G$ or more, will be ejected by a sub-Eddington
outburst. Mildly fluctuating luminosity will lead to dissipation in the plasma
and may explain the observed X-ray temperatures of coronae in low mass X-ray
binaries (LMXBs). At large radial distances from the star ($3\cdot 10^3 R_G$ or
more) the results do not depend on whether or not Poynting-Robertson drag is
included in the calculation.

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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: ao-sci
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The categories of this paper are: alg-geom
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The categories of this paper are: funct-an
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The categories of this paper are: cs
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The categories of this paper are: quant-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: eess
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The categories of this paper are: math-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-lat
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The categories of this paper are: adap-org
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The categories of this paper are: hep-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: cmp-lg