Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The chemical compositions of 10 new sub-DLAs and strong Lyman-limit
  systems at z < 1.5   We present chemical abundance measurements from medium resolution
observations of 8 sub-damped Lyman-alpha absorber and 2 strong Lyman-limit
systems at z < 1.5 observed with the MIKE spectrograph on the 6.5m Magellan II
Clay telescope. These observations were taken as part of an ongoing project to
determine abundances in z < 1.5 quasar absorption line systems (QSOALS)
focusing on sub-DLA systems. These observations increase the sample of Zn
measurements in z < 1.5 sub-DLAs by ~50%. Lines of Mg I, Mg II, Al II, Al III,
Ca II, Mn II, Fe II, and Zn II were detected and column densities were
determined. Zn II, a relatively undepleted element and tracer of the gas phase
metallicity is detected in two of these systems, with [Zn/H]=-0.05\pm0.12 and
[Zn/H]>+0.86. The latter system is however a weak system with N(H I)<18.8, and
therefore may need significant ionisation corrections to the abundances. Fe II
lines were detected in all systems, with an average Fe abundance of
<[Fe/H]>=-0.68, higher than typical Fe abundances for DLA systems at these
redshifts. This high mean [Fe/H] could be due to less depletion of Fe onto dust
grains, or to higher abundances in these systems. We also discuss the relative
abundances in these absorbers. The systems with high metallicity show high
ratios of [Mn/Fe] and [Zn/Fe], as seen previously in another sub-DLA. These
higher values of [Mn/Fe] could be a result of heavy depletion of Fe onto
grains, unmixed gas, or an intrinsically non-solar abundance pattern. Based on
Cloudy modeling, we do not expect ionisation effects to cause this phenomenon.

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The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
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The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: funct-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
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The categories of this paper are: chem-ph
2
The categories of this paper are: math
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The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg