Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: UV Spectroscopy of the Central Star of the Planetary Nebula A43   About 25% of all post-AGB stars are hydrogen-deficient, e.g. the PG1159 stars
with a typical abundance pattern He:C:O = 33:50:17 (by mass). Only four of
about 40 known PG1159 stars exhibit H in their spectra. The exciting star of
the planetary nebula A43 is one of these so-called hybrid PG1159 stars. We
present preliminary results of an on-going spectral analysis by means of NLTE
model-atmosphere techniques based on UV spectra obtained with FUSE, HST/GHRS,
and IUE as well as on optical observations.

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The categories of this paper are: dg-ga
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-ex
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The categories of this paper are: chem-ph
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The categories of this paper are: cs
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The categories of this paper are: stat
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The categories of this paper are: quant-ph
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The categories of this paper are: q-bio
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The categories of this paper are: cmp-lg
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The categories of this paper are: math
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-th
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The categories of this paper are: chao-dyn