Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Massive stars, globular clusters and elliptical galaxies   Globular clusters as $\omega$ Cen and NGC 2808 appear to have a population of
very He-rich stars. From a theoretical point of view, one expects the presence
of He-rich stars in all globular clusters showing an oxygen-sodium (O-Na)
anticorrelation. In this paper, we briefly recall how fast rotating massive
stars could be the main source of the material from which He-rich stars have
formed. We speculate that the UV-upturn phenomenon observed in all elliptical
galaxies might be due to He-rich stars. If this hypothesis is correct then fast
rotating massive stars may have played in the early evolutionary phases of
these systems a similar role as the one they played in the nascent globular
clusters.

12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol