Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Atmospheric Abundances in Post-AGB candidates of Intermediate
  Temperature   Detailed atmospheric abundances have been calculated for a sample of A-G
supergiant stars with IR fluxes and/or high galactic latitudes. HD 172481 and
HD 158616 show clear indications of being post-AGB stars that have experienced
third dredge-up. HD 158616 is carbon-rich while the abundance pattern of HD
172481 and its large Li enhancement gives support to the hot bottom burning
scenario that explains paucity of carbon-rich stars among AGB stars. HD 172324
is very likely a hot post-AGB star that shows a strong carbon deficiency. HD
725, HD 218753 and HD 331319 also appear to be evolved objects between the red
giant and the AGB. HD 9167, HD 173638 with a few exceptions, reflect solar
abundances and no signs of post red giant evolution. They are most likely young
massive disk supergiants. Further analysis of proto-Planetary Nebula HDE 341617
reveals that He lines show signs of velocity stratification. The emission lines
have weakened considerably since 1993. The envelope expands at 19 km s$^{-1}$
relative to the star. Atmospheric abundances, evolutionary tracks and
isochrones are used to estimate masses and ages of all stars in the sample.

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The categories of this paper are: comp-gas
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The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
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The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
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The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-th
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The categories of this paper are: econ
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg