红团簇巨星α元素丰度  

α Element Abundances in the Red Clump Giants

作　　者：赵刚[1] 邱红梅[1] 张华伟[1] 

机构地区：[1]中国科学院北京天文台

出　　处：《天体物理学报》2000年第4期389-394,共6页

基　　金：国家自然科学基金!(No.19725312);国家重点基础研究专项经费

摘　　要：基于高分辨率、高信噪比光谱观测资料，分析了１７颗红团簇巨星的５种α元素（Ｍｇ、Ｓｉ、Ｓ、Ｃａ、Ｔｉ）的化学丰度．结果表明，按金属丰度的不同可以将红团簇巨星分为两类：一类为富金属红团簇巨星（［Ｆｅ／Ｈ］≥０．０）；另一类为贫金属丰度红团簇巨星（［Ｆｅ／Ｈ］≤－０．３）．这两类红团簇巨星中的５种α元素均具有随金属丰度变大而增丰的趋势．同时，分析还表明，这两类红团簇巨星的α元素与铁元素的增丰历史可能是同步的．Based on the high resolution, high signal-to-noise ratio spectra, we analysed five α element abundances (Mg, Si, S, Ca, Ti) in 17 red clump giants. The results show that the red clump giants can be divided into two categories, one is metal-rich with metallicity [Fe/H]≥ 0.0, the other is metal-poor with metallicity [Fe/H]≤-0.3. The abundances of the five α elements of both categories increase with increasing metallicity. The results also indicate that, for both categories, the nucleosynthesis and evolutions of iron and these α elements are probably in step.

关 键 词：恒星 红团簇巨星 大气参数 元素丰度 

分 类 号：P154.1[天文地球—天文学]