Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High-energy gamma-rays from stellar associations   It is proposed that TeV gamma-rays and neutrinos can be produced by cosmic
rays (CRs) through hadronic interactions in the innermost parts of the winds of
massive O and B stars. Convection prevents low-energy particles from
penetrating into the wind, leading to an absence of MeV-GeV counterparts. It is
argued that groups of stars located close to the CR acceleration sites in OB
stellar associations may be detectable by ground-based Cherenkov telescopes.

22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs