Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Three contributions to the "A Half Century of Stellar Pulsation
  Interpretations" proceedings   Paper I: "RR Lyrae Variables in Globular Clusters and the Second-Parameter
Phenomenon"
  Authors: M. Catelan, A. V. Sweigart, J. Borissova Abstract: We propose to use
RR Lyrae variables in globular clusters to probe the origin of the
second-parameter phenomenon.
  Paper II: "New Possible Variables in the Outer-Halo Globular Cluster Palomar
3"
  Authors: J. Borissova, N. Spassova, M. Catelan, V. D. Ivanov Abstract: We
present a list of ten possible variable stars in the globular cluster Pal 3.
Seven are new suspected variables. The variability of the RR Lyr candidate
reported by Burbidge & Sandage (1958), as well as of the Pop. II Cepheid and RR
Lyr from Gratton & Ortolani (1984), are confirmed.
  Paper III: "On the Production of Bright RR Lyrae Variables in Metal-Rich
Globular Clusters"
  Authors: A. V. Sweigart, M. Catelan Abstract: See astro-ph/9708174.

12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int