Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonradial Pulsations in Classical Cepheids of the Magellanic Clouds   We have performed systematic frequency analysis of the LMC Cepheids observed
by OGLE project. Several new types of pulsation behaviour are identified,
including triple-mode and amplitude-modulated double-mode pulsations. In ~10%
of the first overtone Cepheids we find low amplitude secondary periodicities
corresponding to nonradial modes. This is the first evidence for excitation of
nonradial oscillations in Classical Cepheid variables.

22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an