标题： 冷极端氦星丰度分析：LSS 3378 显示英文标题

标题： Abundance analysis of cool extreme helium star: LSS 3378

摘要： 冷极端氦（EHe）星LSS 3378的丰度分析被展示。 该丰度分析使用了LTE线形成和为EHe星构建的LTE模型大气。 LSS 3378的大气显示出氢燃烧、氦燃烧以及s过程核合成的证据。 铁峰和α元素推导出的丰度表明不存在选择性分馏或其他会扭曲这些元素化学成分的过程。 因此，采用铁丰度（log epsilon(Fe) = 6.1）作为初始金属量指标。 LSS 3378的测量丰度与北冕座R型新星（RCB）星以及作为一组的其余EHe星进行了比较。 显示英文摘要

摘要： Abundance analysis of the cool extreme helium (EHe) star LSS 3378 is presented. The abundance analysis is done using LTE line formation and LTE model atmospheres constructed for EHe stars. The atmosphere of LSS 3378 shows evidence of H-burning, He-burning, and s-process nucleosynthesis. The derived abundances of iron-peak and alpha-elements indicate absence of selective fractionation or any other processes that can distort chemical composition of these elements. Hence, the Fe abundance (log epsilon(Fe) = 6.1) is adopted as an initial metallicity indicator. The measured abundances of LSS 3378 are compared with those of R Coronae Borealis (RCB) stars and with rest of the EHe stars as a group.