强钡星和弱钡星的比较  

Compare Strong Barium Stars with Mild Barium Stars

作　　者：刘俊红[1] 鹿雯[2] 张彩霞[1] 崔文元[3] 

机构地区：[1]石家庄学院物理系,河北石家庄050035 [2]成都市第七中学,四川成都610000 [3]河北师范大学物理科学与信息工程学院,河北石家庄050016

出　　处：《河北师范大学学报（自然科学版）》2008年第1期49-53,共5页Journal of Hebei Normal University：Natural Science

基　　金：国家自然科学基金(10673002)

摘　　要：利用星风吸积模型,计算了钡星的初始质量和AGB伴星的金属丰度对弱钡星和强钡星超丰因子的影响,计算了弱钡星和强钡星重元素(Y,Nd)丰度随轨道周期终值的变化,并和观测值作了比较.由此得出结论:强钡星和弱钡星的区别主要是金属丰度不同(即年代不同),而不是轨道距离;弱钡星和强钡星相比,属于较年轻、质量较大、金属丰度较丰富的星族;这就意味,s-元素的核合成在低金属丰度星族更有效产生.For discussion origin of chemical peculiar different of mild and strong barium stars with accretion scenario, computed that overabundance factor and [s/Fe] of mild and strong barium stars changed with metallicity and initiai mass. These results suggest that the difference between mild and strong barium stars is mainly one of galactic population rather than of orbitai separation,and indicate that mild barium stars belong to a younger, more metal-rich and more massive population than strong barium stars, which implies heavy element synthesis is more efficient in alow-metallicity population.

关 键 词：钡星 超丰因子 金属丰度 

分 类 号：P142.9[天文地球—天体物理]