Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Wind structure in late-B supergiants   Extended spectroscopic datasets of several late-B stars of luminosity class
Ia revealed the presence of similar peculiarities in their H alpha profiles,
which might be interpreted as indications of deviation from spherically
symmetric, smooth wind approximation. Surface structures due to non-radial
pulsations or weak, large-scale, dipole magnetic fields might be responsible
for creating wind structure in the envelopes of these stars.

21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio