Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Revealing the Nature of Asymmetric Planetary Nebulae through Abundance
  Analysis   The correlations between planetary nebula (PN) morphology and the nature of
their progenitors are explored by examining homogeneous PN samples in the
Galaxy and the Magellanic Clouds. We selected PNe with reliable abundances from
spectral analysis, and whose morphology is known, and compared the abundances
of the element at variance with stellar evolution with the final yields of
Asymptotic Giant Branch (AGB) stellar models. We found that most asymmetric PNe
derive from the evolution of massive AGB stars both in the Galactic disk and
the Magellanic Clouds.

10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph