Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radial solitary waves in periodic variable stars   It is shown that the oscillations of brightness in classical Cepheids and
other 'pulsating' variable stars are caused rather by the passing of radial
solitary waves through the photosphere of a star, than by pulsations of a star.
Radial solitary waves also determine the oscillations of brightness in some
other types of periodic variable stars ordinary not considered as pulsating
stars.

12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph