Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Wolf-Rayet stars in young massive star clusters as potential sources of
  Galactic cosmic rays   For most elements, the isotopic ratios seen in cosmic rays (CRs) are similar
to those in the solar wind. The most important exception to this is
$^{22}$Ne/$^{20}$Ne where the CR value is $\sim 5$ times that of the solar
wind. According to most recent models of nucleosynthesis, a large amount of
$^{22}\mathrm{Ne}$ is generated in Wolf-Rayet (WR) stars. In the winds of
carbon sequence WR stars, i.e., WC stars, the isotopic ratio
$^{22}\mathrm{Ne}$/$^{20}\mathrm{Ne}$ can be much larger than in the solar
wind. Here, we consider CRs produced by $^{22}\mathrm{Ne}$-enriched WR winds in
compact clusters of young massive stars like Westerlund~1. We assume that
efficient CR acceleration in clusters occurs over the WR lifetime in an
ensemble of shock waves from multiple massive star winds. We estimate the
fraction of all Galactic CRs such sources may produce for a given set of
parameters.

1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th