论文标题
北方天空中矮星的高分辨率光谱研究：锂，碳和氧气丰度
High-resolution Spectroscopic Study of Dwarf Stars in the Northern Sky: Lithium, Carbon, and Oxygen Abundances
论文作者
论文摘要
锂，碳和氧的丰度是使用光谱合成来得出的，该样品的样品为249个明亮的F，G和K北半球矮人矮人的高分辨率光谱，并在Vilnius University的Moletai天文学观测值中获得了高分辨率光谱。样品恒星具有金属性，有效温度和-0.7至0.4 DEX的年龄； 5000和6900 K;因此，1和12 gyr。我们确认在超极金属度下迄今无法解释的锂丰度降低 - 我们的样品恒星中的$ a $ a（li），在[Fe/h]中下降0.7 dex范围从+0.10到+0.55 dex。此外，我们确定了具有相似年龄，大气参数和旋转速度的恒星，但锂丰度明显不同，这表明在解释出色的锂含量时应考虑其他特定的进化因子。九颗恒星主要是超级金属度，即在确定C和O丰度的78颗恒星中约有12％的C/O数值比大于0.65，因此可能形成富含碳的岩石行星。在我们的样品中可用的十颗行星托管恒星与恒星没有明显的差异，没有在其锂含量方面检测到行星。
Abundances of lithium, carbon, and oxygen have been derived using spectral synthesis for a sample of 249 bright F, G, and K Northern Hemisphere dwarf stars from the high-resolution spectra acquired with the VUES spectrograph at the Moletai Astronomical Observatory of Vilnius University. The sample stars have metallicities, effective temperatures, and ages between -0.7 and 0.4 dex; 5000 and 6900 K; 1 and 12 Gyr, accordingly. We confirm a so far unexplained lithium abundance decrease at supersolar metallicities - $A$(Li) in our sample stars, which drop by 0.7 dex in the [Fe/H] range from +0.10 to +0.55 dex. Furthermore, we identified stars with similar ages, atmospheric parameters, and rotational velocities, but with significantly different lithium abundances, which suggests that additional specific evolutionary factors should be taken into account while interpreting the stellar lithium content. Nine stars with predominantly supersolar metallicities, i.e. about 12 % among 78 stars with C and O abundances determined, have the C/O number ratios larger than 0.65, thus may form carbon-rich rocky planets. Ten planet-hosting stars, available in our sample, do not show a discernible difference from the stars with no planets detected regarding their lithium content.
