该研究基于高分辨率光学光谱，详细分析了HD8270、HD13551和HD22589三颗候选钡矮星的金属丰度，发现它们分别具有-0.43、-0.28和-0.12的铁丰度。这些恒星的铁和α元素遵循盘状星系的丰度模式，而重元素显示太阳的4-8倍增益。文章还讨论了s-过程元素，与其它钡巨星和矮星进行了比较，并探讨了钡巨星与矮星的金属分布。
摘要：
This work presents the abundance patterns of three barium dwarf candidates, HD 8270, HD 13551, and HD 22589, based on high-resolution optical spectra. This work also reports the spectroscopic stellar parameters, temperature, and microturbulent velocity, as well as the stellar surface gravity from a solution of excitation and ionization equilibria of Fe I and Fe II lines under the assumption of local thermodynamic equilibrium. The abundance analysis reveals that HD 8270, HD 13551, and HD 22589 have metallicities of [Fe/H]=-0.43, -0.28, and -0.12, respectively. It was found that the abundances of iron group and α-elements follow the abundance pattern of a disk population. The heavy-element abundance patterns of the three stars show enhancements by a factor of 4-8 with respect to the Sun. The abundances of the s-process elements are discussed and compared with other barium giants and dwarfs through diagrams involving the indices [hs/ls] and [s/Fe]. The metallicity distribution of barium giants and dwarfs is also discussed.
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