Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: X-ray Line Emission from Evaporating and Condensing Accretion Disk
  Atmospheres   We model the X-rays reprocessed by an accretion disk in a fiducial low-mass
X-ray binary system with a neutron star primary. An atmosphere, or the
intermediate region between the optically thick disk and a Compton-temperature
corona, is photoionized by the neutron star continuum. X-ray lines from the
recombination of electrons with ions dominate the atmosphere emission and
should be observable with the Chandra and XMM-Newton high-resolution
spectrometers. The self-consistent disk geometry agrees well with optical
observations of these systems, with the atmosphere shielding the companion from
the neutron star. At a critical depth range, the disk gas has one thermally
unstable and two stable solutions. A clear difference between the model spectra
exists between evaporating and condensing disk atmospheres. This difference
should be observable in high-inclination X-ray binaries, or whenever the
central continuum is blocked by absorbing material and the extended disk
emission is not.

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The categories of this paper are: math
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The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: q-bio
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The categories of this paper are: comp-gas
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The categories of this paper are: acc-phys
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The categories of this paper are: atom-ph
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The categories of this paper are: supr-con
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The categories of this paper are: solv-int
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-th