Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Chemical Abundances of Tycho G in Supernova Remnant 1572   We present an analysis of the chemical abundances of the star Tycho G in the
direction of the remnant of supernova (SN) 1572, based on Keck high-resolution
optical spectra. The stellar parameters of this star are found to be those of a
G-type subgiant with $T_{\mathrm{eff}} = 5900 \pm 100$ K, \loggl $ = 3.85 \pm
0.30$ dex, and $\mathrm{[Fe/H]} = -0.05 \pm 0.09$. This determination agrees
with the stellar parameters derived for the star in a previous survey for the
possible companion star of SN 1572 (Ruiz-Lapuente et al. 2004). The chemical
abundances follow the Galactic trends, except for Ni, which is overabundant
relative to Fe, $[{\rm Ni/Fe}] $ $=$ 0.16 $\pm$ 0.04. Co is slightly
overabundant (at a low significance level). These enhancements in Fe-peak
elements could have originated from pollution by the supernova ejecta. We find
a surprisingly high Li abundance for a star that has evolved away from the main
sequence. We discuss these findings in the context of companion stars of
supernovae.

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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-th
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The categories of this paper are: adap-org
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The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
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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: cond-mat
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The categories of this paper are: comp-gas
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The categories of this paper are: supr-con
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The categories of this paper are: mtrl-th
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The categories of this paper are: math-ph
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The categories of this paper are: eess
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The categories of this paper are: bayes-an
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The categories of this paper are: quant-ph