标题： 活动红巨星大气中s-过程元素的过剩 显示英文标题

标题： Overabundance of s-process elements in the atmosphere of the active red giant

摘要： 基于使用 NES 光谱仪（俄罗斯科学院特殊天体物理观测台的 6 米 BTA 望远镜）获取的高分辨率（R=60000）光谱，我们利用模型恒星大气方法确定了活动红巨星 PZ Mon（属于 RS CVn 变星一类）大气中从锂到铕共 26 种元素的丰度。我们考虑了超精细分裂、同位素位移以及非局部热平衡效应。对我们的数据进行分析后发现，PZ Mon 的锂和中子俘获元素的丰度高于普通红巨星。对于锂而言，这种过量丰度可以通过恒星的活动性来解释，而 s-元素的过量丰度则可能与中等钡星的性质类似。 显示英文摘要

摘要： Based on high-resolution (R=60000) spectra taken with the NES spectrograph (the 6-m BTA telescope, the Special Astrophysical Observatory of the Russian Academy of Science), we have determined the abundances of 26 elements, from lithium to europium, in the atmosphere of the active red giant PZ Mon, which belongs to the class of RS CVn variable stars, by the method of model stellar atmospheres. We have taken into account the hyperfine splitting, the isotopic shift, and the departure from local thermodynamic equilibrium. Analysis of our data has revealed an overabundance of lithium and neutron-capture elements compared to normal red giants. For lithium, this is explained by the activity of the star, while the overabundance of s-elements is presumably similar in nature to that in moderate barium stars.