Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Be stars in X-ray binary systems   This paper will review the status of our observations and understanding of Be
stars in X-ray binary systems. In virtually all cases the binary partner to the
Be star is a neutron star. The circumstellar disk provides the accretion fuel
and hence stimulates the X-ray emission, whilst the neutron star provides a
valuable probe of the environment around the Be star. The results coming from
studies of such systems are helping in our understanding of the Be phenomenon.

5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
3
The categories of this paper are: physics
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th