Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Self Regulated Shocks in Massive Star Binary Systems   In an early-type, massive star binary system, X-ray bright shocks result from
the powerful collision of stellar winds driven by radiation pressure on
spectral line transitions. We examine the influence of the X-rays from the
wind-wind collision shocks on the radiative driving of the stellar winds using
steady state models that include a parameterized line force with X-ray
ionization dependence. Our primary result is that X-ray radiation from the
shocks inhibits wind acceleration and can lead to a lower pre-shock velocity,
and a correspondingly lower shocked plasma temperature, yet the intrinsic X-ray
luminosity of the shocks, LX remains largely unaltered, with the exception of a
modest increase at small binary separations. Due to the feedback loop between
the ionizing X-rays from the shocks and the wind-driving, we term this scenario
as self regulated shocks. This effect is found to greatly increase the range of
binary separations at which a wind-photosphere collision is likely to occur in
systems where the momenta of the two winds are significantly different.
Furthermore, the excessive levels of X-ray ionization close to the shocks
completely suppresses the line force, and we suggest that this may render
radiative braking less effective. Comparisons of model results against
observations reveals reasonable agreement in terms of log(LX/Lbol). The
inclusion of self regulated shocks improves the match for kT values in roughly
equal wind momenta systems, but there is a systematic offset for systems with
unequal wind momenta (if considered to be a wind-photosphere collision).

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The categories of this paper are: hep-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: chao-dyn
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The categories of this paper are: funct-an
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The categories of this paper are: comp-gas
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: physics
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-th
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The categories of this paper are: math-ph
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The categories of this paper are: math
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The categories of this paper are: q-alg
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The categories of this paper are: cond-mat
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The categories of this paper are: adap-org
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The categories of this paper are: stat