论文标题
使用钡星探测银河系的核合成
Probing the Galactic s-process nucleosynthesis using barium stars
论文作者
论文摘要
我们银河系中中子捕获元素的起源和进化知之甚少。在这项工作中，我们试图使用钡恒星作为探针来理解银河系的核合成。我们已经对三个进行了高分辨率的光谱分析 钡星HD 36650，HD 207585和HD 219116。HD 219116的分析基于HCT/HESP数据，分辨率为60,000，涵盖了波长区域3530-9970 {\rmÅ}。对于HD 36650，我们以48,000的分辨率使用了Feros Spectrum，覆盖了波长区域3520-9200 {\rmÅ}。对于HD 207585，使用了VLT/UVE的光谱，以48,000的分辨率覆盖了波长区域3290-6650 {\rmÅ}。我们的分析清楚地表明，这些钡恒星的表面化学组成富含来自其前同伴低质量AGB恒星的S过程核合成产物。提出了基于现有的核合成理论的丰度比率的分布的讨论。
The origin and evolution of neutron-capture elements in our Galaxy is poorly understood. In this work, we have attempted to understand the Galactic s-process nucleosynthesis using barium stars as probes. We have performed high resolution spectroscopic analysis for three barium stars HD 36650, HD 207585 and HD 219116. The analysis of HD 219116 is based on HCT/HESP data at a resolution of 60,000 covering a wavelength region 3530-9970 {\rm Å}. For HD 36650, we have used the FEROS spectrum at a resolution of 48,000 covering the wavelength region 3520-9200 {\rm Å}. For HD 207585, the spectrum from VLT/UVES at a resolution of 48,000 covering the wavelength region 3290-6650 {\rm Å} is used. Our analysis clearly shows that the surface chemical composition of these barium stars are enriched by s-process nucleosynthesis products coming from their former companion low-mass AGB stars. A discussion on the distribution of abundance ratios based on the existing nucleosynthesis theories is presented.
