Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Abundances of Mn, Co and Eu in a sample of 20 F-G disk stars: the
  influence of hyperfine structure splitting   We present Mn, Co and Eu abundances for a sample of 20 disk F and G dwarfs
and subgiants with metallicities in the range -0.8 <= [Fe/H] <= +0.3. We
investigate the influence of hyperfine structure (HFS) on the derived
abundances of Mn and Co by using HFS data from different sources in the
literature, as well as calculated HFS from interaction factors A and B. Eu
abundances were obtained from spectral synthesis of one Eu II line that takes
into account HFS from a series of recent laboratory measurements. For the lines
analyzed in this study, we find that for manganese, the differences between
abundances obtained with different HFSs are no larger than 0.10 dex. Our cobalt
abundances are even less sensitive to the choice of HFS than Mn, presenting a
0.07 dex maximum difference between determinations with different HFSs.
However, the cobalt HFS data from different sources are significantly
different. Our abundance results for Mn offer an independent confirmation of
the results from Prochaska & McWilliam (2000), who favour type Ia supernovae as
the main nucleosynthesis site of Mn production, in contrast to trends of Mn
versus metallicity previously reported in the literature. For Co, we obtain
[Co/Fe] ~ 0.0 in the range -0.3 < [Fe/H] < +0.3 and [Co/Fe] rising to a level
of +0.2 when [Fe/H] decreases from -0.3 to -0.8, in disagreement with recent
results in the literature. The observed discrepancies may be attributed to the
lack of HFS in the works we used for comparison. Our results for Eu are in
accordance with low-mass type II supernovae being the main site of the
r-process nucleosynthesis.

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The categories of this paper are: q-fin
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The categories of this paper are: math-ph
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The categories of this paper are: adap-org
2
The categories of this paper are: math
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The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
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The categories of this paper are: nucl-th
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The categories of this paper are: funct-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: acc-phys
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The categories of this paper are: ao-sci
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The categories of this paper are: quant-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: econ
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The categories of this paper are: dg-ga
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The categories of this paper are: mtrl-th