Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: UV and FUV spectroscopy of the hybrid PG 1159-type central star NGC 7094   Previous studies aiming at the iron-abundance determination in three PG 1159
stars (K 1-16, PG 1159-035, NGC 7094) and a [WC]-PG 1159 transition star (Abell
78) have revealed that no object shows any iron line in the UV spectrum. The
stars are iron-deficient by at least 1 dex, typically. A possible explanation
is that iron nuclei were transformed by neutron captures into heavier elements
(s-process), however, the extent of the iron-destruction would be much stronger
than predicted by AGB star models. But if n-captures are the right explanation,
then we should observe an enrichment of trans-iron elements. In this paper we
report on our search for a possible nickel overabundance in one of the four Fe
deficient PG 1159 stars, namely the central star NGC 7094. We are unable to
identify any nickel line in HST and FUSE spectra and conclude that Ni is not
overabundant. It is conceivable that iron was transformed into even heavier
elements, but their identification suffers from the lack of atomic data.

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The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin