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arXiv 0809.0601astro-ph
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超新星遗迹1572中第谷G的化学丰度

The Chemical Abundances of Tycho G in Supernova Remnant 1572

Jonay I. González Hernández, Pilar Ruiz-Lapuente, Alexei V. Filippenko, Ryan J. Foley, Avishay Gal-Yam, Joshua D. Simon

摘要:

我们提出了一个分析的化学丰度的恒星第谷G在超新星(SN)1572的遗迹的方向,根据凯克高分辨率光谱。这颗恒星的恒星参数被认为是一颗G型次巨星,具有$T_{\mathrm{eff}} = 5900 \pm 100$ K、\loggl $ = 3.85 \pm 0.30$ dex和$\mathrm{[Fe/H]} = -0.05 \pm 0.09$。这一测定结果与之前对SN 1572可能的伴星进行的巡天(Ruiz-Lapuente et al. 2004)中得出的恒星参数一致。化学丰度遵循银河系的趋势,除了镍,这是过剩的相对于铁,$[{\rm Ni/Fe}] $ $=$ 0.16 $\pm$ 0.04。Co略微过量(显著性水平较低)。这些铁峰元素的增强可能源于超新星喷出物的污染。我们发现了一个令人惊讶的高锂丰度的恒星,已演变远离主序星。我们讨论这些发现的背景下,超新星的伴星。

英文摘要:

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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