HD 140283元素丰度分析及弱r-过程元素天体物理来源  

Element Abundance Analysis of HD 140283 and Astrophysics Sources of Weak r-process Elements

作　　者：马文娟 李宏杰[2] 张璐 张波[4] MA Wen-juan;LI Hong-jie;ZHANG Lu;ZHANG Bo(Department of Physics and Information Engineering,Cangzhou Normal University,Cangzhou 061001;School of Science,Hebei University of Science and Technology,Shijiazhuang 050018;Department of Mathematics and Information Science,Hebei Normal University,Shijiazhuang 050024;Department of Physics Science and Information Engineering,Hebei Normal University,Shijiazhuang 050024)

机构地区：[1]沧州师范学院物理与信息工程学院,沧州061001 [2]河北科技大学理学院,石家庄050018 [3]河北师范大学数学与信息科学学院,石家庄050024 [4]河北师范大学物理科学与信息工程学院,石家庄050024

出　　处：《天文学报》2020年第5期1-7,共7页Acta Astronomica Sinica

基　　金：国家自然科学基金项目(11673007、11403007);河北省自然科学基金项目(A2019110051);沧州市自然科学基金项目(197000003);沧州师范学院校内基金(xnjj11910)资助。

摘　　要：HD 140283是一颗近邻极贫金属亚巨星,形成于宇宙大爆炸初期,被认为是迄今为止最古老的恒星之一,同时它也是一颗典型的弱r-过程星,对它的研究有助于深入理解宇宙早期演化、丰富元素核合成理论.将HD 140283从C到Zn的观测丰度与单个超新星(SN)事件元素理论产量进行拟合,得出HD 140283可能诞生于前身星质量为22.5 M⊙(下标"⊙"代表太阳)的超新星爆发污染的星云.基于同样的方法,研究了另外5颗典型弱r-过程星,分别得出了污染产生这些恒星的气体云的超新星前身星质量,进一步推测了弱r-过程可能发生的天体物理环境.HD 140283,a nearby extremely metal-poor subgiant star,formed shortly after the big bang,is thought to be the oldest star to date,and also a typical weak r-process star.Study of this star is of great significance for understanding the early history of the universe,and enriching the element nucleosynthesis theory.Based on the observed abundances of weak r-process star HD 140283 and theoretical yields of single supernova(SN),we fit the observational elemental abundances(from O to Zn)to the entire library of single SN yield,and derive that HD 140283 may have been born from a nebula polluted by the explosion of supernova whose progenitor mass is 22.5 M⊙(the subscript"⊙"means the solar mass).Based on the same method,we study the other five typical weak r-process stars,and respectively derive the progenitor masses of supernova which have polluted the nebulas forming these stars.Furthermore,the possible astrophysics sources of weak r-process are inferred.

关 键 词：恒星:极贫金属星 恒星:HD 140283 恒星:丰度 核合成:弱r-过程 

分 类 号：P144[天文地球—天体物理]