贫金属星重元素平均丰度的金属丰度分区研究

Studying the Average Abundances of Heavy Elements in Metal-poor Stars in Different Metallicity Ranges

将[Fe／H]从-3．0到0．0等分成10个区间，利用三种中子俘获过程的典型元素的观测丰度平均值，研究各核合成过程在各区间对重元素丰度的平均贡献，以及其它重元素的平均丰度，并与观测平均丰度进行比较．结果表明，在[Fe／H]＞－2．2范围内，各重元素核合成过程产生的重元素平均丰度分布与太阳系相似，但不同核合成过程的平均贡献比例与太阳系不相同．

Dividing the metallicity range, [Fe/H] from -3.0 t0 0.0, into ten subranges, we calculate the average contribution from three kinds of nucleosynthesis proceses in every subrange by using the average observational data of the typical elements Ba, Sr, and Eu. Furthermore,we calculate the average abundances of some other heavy elements, which are then compared with the average observational values. Our results show that the average contributionfrom different nucleosynthesis processes to the heavy-element abundance with [Fe/H] > -2.2 is similar to the solar system, but the contribution ratios of the different nucle0synthesis processes are differeflt from the solar system.