Abstract

We use the data of our extended catalog of spectroscopic determinations of elemental abundances in the atmospheres of Galactic-field RR Lyrae type variables to show that metal-rich RR Lyraes ([Fe/H] > −1.0) have anomalous abundances of some elements. In particular, the relative abundances of scandium, titanium, and yttrium in metal-rich RR Lyrae type variables are lower than the corresponding abundances in field stars of similar metallicity beyond the errors. We discuss the errors of the determination of the abundances of the above elements and point out the fact that no europium, zirconium, and lanthanum abundance determinations are available for metal-rich RR Lyrae type variables. We also analyze various possible causes of the observed peculiarities of the chemical composition of metal-rich RR Lyrae type variables.

中文翻译：

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富金属领域RR天琴星中某些元素的丰度特质

摘要

我们使用光谱学测定的扩展目录数据，在银河场RR Lyrae类型变量的大气中确定元素丰富的RR Lyraes（[Fe / H] > -1 。0）某些元素异常丰富。特别是，富金属的RR Lyrae类型变量中scan，钛和钇的相对丰度低于具有类似金属度的野外恒星中的相应丰度，且超出误差。我们讨论确定上述元素的丰度的错误，并指出以下事实：对于富含金属的RR Lyrae类型变量，no，锆和镧的丰度测定不可用。我们还分析了富金属的RR Lyrae类型变量的化学组成所观察到的特性的各种可能原因。