标题： 两个新发现的钡巨星的全面丰度研究 显示英文标题

标题： Full abundance study of two newly discovered barium giants

摘要： 钡（Ba）星是化学异常的恒星，其表面丰度显示出由慢中子捕获过程（所谓的s-过程）产生的重元素增强。这些恒星尚未充分演化到在其内部进行s-过程，因此被认为是双星相互作用的产物。Ba星形成于一个以前的渐近巨星分支（AGB）伴星，现在是一颗白矮星，通过质量转移向它们提供富含s-过程物质的污染。本文详细描述了两个新发现的Ba巨星的化学特征。我们的主要目标是确认它们作为外源性s-过程星的地位，并探索潜在的双星和白矮星伴星。我们使用甚大望远镜上的UVES获得高分辨率光谱，以确定目标的化学特性。我们进行了逐线分析，并测量了22种元素，内部精度高达0.04 dex。通过径向速度变化和光谱能量分布拟合来研究目标的双星性质。我们发现两个目标在所有测量的s-过程元素中都表现出增强，将我们的目标分类为Ba巨星。这是它们首次在文献中被如此分类。此外，这两颗恒星在Eu方面表现出轻微增强，但不如纯s-过程元素那样明显，这表明污染它们的来源是纯s-过程来源。最后，我们确认这两个目标是RV变星，很可能是双星系统。这两个新发现的污染双星的丰度符合经典的Ba巨星，为更好地理解AGB星中的s-过程提供了观测约束。 显示英文摘要

摘要： Barium (Ba) stars are chemically peculiar stars that show enhanced surface abundances of heavy elements produced by the slow-neutron-capture process, the so-called s-process. These stars are not sufficiently evolved to undergo the s-process in their interiors, so they are considered products of binary interactions. Ba stars form when a former Asymptotic Giant Branch (AGB) companion, which is now a white dwarf, pollutes them with s-process-rich material through mass transfer. This paper presents a detailed chemical characterization of two newly discovered Ba giants. Our main goal is to confirm their status as extrinsic s-process stars and explore potential binarity and white dwarf companions. We obtained high-resolution spectra with UVES on the Very Large Telescope to determine the chemical properties of the targets. We perform line-by-line analyses and measure 22 elements with an internal precision up to 0.04 dex. The binary nature of the targets is investigated through radial velocity variability and spectral energy distribution fitting. We found that both targets are enhanced in all the measured s-process elements, classifying our targets as Ba giants. This is the first time they are classified as such in the literature. Additionally, both stars present a mild enhancement in Eu, but less than in pure s-process elements, suggesting that the sources that polluted them were pure s-process sources. Finally, we confirmed that the two targets are RV variable and likely binary systems. The abundances in these two newly discovered polluted binaries align with classical Ba giants, providing observational constraints to better understand the s-process in AGB stars.