Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High energy radiation from luminous and magnetized stars   A part of early type stars is characterised by strong dipole magnetic field
that is modified by the outflow of dense wind from the stellar surface. At some
distance from the surface (above the Alfven radius), the wind drives the
magnetic field into the reconnection in the equatorial region of the dipole
magnetic field. We propose that electrons accelerated in these reconnection
regions can be responsible for efficient comptonization of stellar radiation
producing gamma-ray emission. We investigate the propagation of electrons in
the equatorial region of the magnetosphere by including their advection with
the equatorial wind. The synchrotron and IC spectra are calculated assuming
that a significant part of the wind energy is transferred to relativistic
electrons. As an example, the parameters of luminous, strongly magnetized star
HD 37022 ($\Theta^1$ Ori C) are considered. The IC gamma-ray emission is
predicted to be detected either in the GeV energy range by the Fermi-LAT
telescope or in the sub-TeV energies by the Cherenkov Telescope Array. However,
since the stellar winds are often time variable and the magnetic axis can be
inclined to the rotational axis of the star, the gamma-ray emission is expected
to show variability with the rotational period of the star and, on a longer
time scale, with the stellar circle of the magnetic activity. Those features
might serve as tests of the proposed scenario for gamma-ray emission from
single, luminous stars.

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The categories of this paper are: gr-qc
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The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
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The categories of this paper are: adap-org
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The categories of this paper are: comp-gas
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
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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: quant-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: bayes-an
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The categories of this paper are: nlin
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The categories of this paper are: stat
30
The categories of this paper are: q-alg
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The categories of this paper are: hep-lat