Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: X-rays from magnetically channeled winds of OB stars   OB stars with strong radiation-driven stellar winds and large-scale magnetic
fields generate strong and hard X-ray emission via the Magnetically Channeled
Wind Shock (MCWS) mechanism. In this brief paper, I describe four separate
X-ray diagnostics of the MCWS mechanism in OB stars, with applications to the
prototype young O star, theta-1 Ori C.

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The categories of this paper are: nucl-ex
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The categories of this paper are: q-alg
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The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
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The categories of this paper are: hep-lat
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The categories of this paper are: eess
9
The categories of this paper are: nlin
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The categories of this paper are: comp-gas
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph