基于伊巴谷数据分析的红团簇巨星的铁丰度

IRON ABUNDANCE ANALYSIS OF RED CLUMP GIANTS BASED ON HIPPARCO DATA

给出了 17颗红团簇巨星的观测资料 .确定了这些样本星的恒星大气参数 ,得到了这些巨星的铁丰度 ,并且讨论了铁丰度与恒星大气参数的相关性 .根据铁丰度与表面重力以及恒星质量和有效温度之间的相关性 ,可以将这类红团簇巨星细分为 2类 :一类质量较大 ,具有较大的表面重力和金属丰度 ;另一类贫金属星 ,其质量和表面重力都相对偏小 .对每一类恒星 。

The observation data of 17 red clump giants are presented. The fundamental parameters and iron abundances of these sample stars are determined. The correlation between the iron abundances and the other stellar parameters are discussed. The analysis of our data indicates that these sample stars can be classified into two different types. One is metal rich and relatively massive with large gravity, while another metal poor with lower mass and surface gravity. For each group stars, both the surface gravity and the stellar mass increase with increasing effective temperature.