论文标题
F-G-K矮星的丑闻丰度在宽的金属范围内
Scandium abundances of F-G-K dwarf stars in a wide metallicity range
论文作者
论文摘要
使用最新的原子数据构建了SC II的新模型原子。为了测试目的，对具有可靠确定的大气参数的三个星进行了非本地热力学平衡（非LTE）计算：太阳，HD〜61421（procyon）和HD〜84937。与LTE情况相比，与LTE相比，LTE偏离的偏差会导致较小的丰度错误，并且在从不同的SC II线中获得的误差棒丰度中保持一致。太阳能非LTE丰度log eps_sun = 3.12+-0.05超过了Lodders（2021）推荐的气象丰度，比0.08〜DEX。但是，对于Procyon，获得了与气象丰度的0.02〜DEX之间的一致性。使用高分辨率光谱，我们确定了在金属度范围内的56颗恒星-2.62 <= [fe/h] <= 0.24的Scandium LTE和非LTE丰度。 [sc/fe]对[Fe/H]的依赖性证明了与[Fe/H] <-1的铁（[SC/FE] 〜0.2）相似的相似性：对于[Fe/H] <-1的铁（[SC/Fe] 〜0.2）而增强，并且[SC/FE]随着[Fe/H]的增加而降低[fe/h] <-1，以增加[Fe/H]。 scand和钛之间有着密切的关系。获得的结果为Scandium Origin的情景提供了观察性约束。
A new model atom of Sc II was constructed using the most up-to-date atomic data. For the testing purpose, the non-local thermodynamic equilibrium (non-LTE) calculations were carried out for three stars with reliably determined atmospheric parameters: the Sun, HD~61421 (Procyon), and HD~84937. Accounting for deviations from LTE leads to smaller abundance errors compared with the LTE case and consistent within the error bars abundances obtained from different Sc II lines. Solar non-LTE abundance log eps_Sun = 3.12+-0.05 exceeds the meteoritic abundance recommended by Lodders (2021), by 0.08~dex. But agreement within 0.02~dex with the meteoritic abundance is obtained for Procyon. Using high-resolution spectra, we determined the scandium LTE and non-LTE abundances for 56 stars in the metallicity range -2.62 <= [Fe/H] <= 0.24. The dependence of [Sc/Fe] on [Fe/H] demonstrates a similarity with the behavior of the alpha-process elements: scandium is enhanced relative to iron ([Sc/Fe] ~ 0.2) for [Fe/H] < -1, and [Sc/Fe] decreases with increasing [Fe/H] for the higher metallicity. There is a hint of a tight relation between abundances of scandium and titanium. The results obtained provide observational constraints to the scenarios of scandium origin.
