Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic fields in non-convective regions of stars   We review the current state of knowledge of magnetic fields inside stars,
concentrating on recent developments concerning magnetic fields in stably
stratified (zones of) stars, leaving out convective dynamo theories and
observations of convective envelopes. We include the observational properties
of A, B and O-type main-sequence stars, which have radiative envelopes, and the
fossil field model which is normally invoked to explain the strong fields
sometimes seen in these stars. Observations seem to show that Ap-type stable
fields are excluded in stars with convective envelopes. Most stars contain both
radiative and convective zones, and there are potentially important effects
arising from the interaction of magnetic fields at the boundaries between them.
Related to this, we discuss whether the Sun could harbour a magnetic field in
its core. Recent developments regarding the various convective and radiative
layers near the surfaces of early-type stars and their observational effects
are examined. We look at possible dynamo mechanisms that run on differential
rotation rather than convection. Finally we turn to neutron stars with a
discussion of the possible origins for their magnetic fields.

12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
1
The categories of this paper are: cs
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci