河北大学学报(自然科学版)
河北大學學報(自然科學版)
하북대학학보(자연과학판)
JOURNAL OF HEBEI UNIVERSITY(NATURAL SCIENCE EDITION)
2010年
2期
146-151
,共6页
刘永利%崔文元%张江%刘护国
劉永利%崔文元%張江%劉護國
류영리%최문원%장강%류호국
星系化学演化%AGB星%核合成%中子辐照量
星繫化學縯化%AGB星%覈閤成%中子輻照量
성계화학연화%AGB성%핵합성%중자복조량
chemical evolution of galaxy%AGB stars%nucleosynthesis%neutron exposure
先引入随时间t变化的星系中子辐照量分布函数ρ_(gal)(t,τ)描述各演化阶段星系s-过程核素丰度的分布规律.利用星系化学演化的三成分模型导出星系中子辐照量分布函数的演化方程,从而建立星系的中子辐照量分布函数ρ_(gal)(t,τ)与AGB星的中子辐照量分布函数ρ_(AGB)(τ)之间的关系.取AGB星中子辐照量为指数分布,当取t=t_⊙时,得到了太阳系的中子辐照量分布ρ_(Sun)(τ).
先引入隨時間t變化的星繫中子輻照量分佈函數ρ_(gal)(t,τ)描述各縯化階段星繫s-過程覈素豐度的分佈規律.利用星繫化學縯化的三成分模型導齣星繫中子輻照量分佈函數的縯化方程,從而建立星繫的中子輻照量分佈函數ρ_(gal)(t,τ)與AGB星的中子輻照量分佈函數ρ_(AGB)(τ)之間的關繫.取AGB星中子輻照量為指數分佈,噹取t=t_⊙時,得到瞭太暘繫的中子輻照量分佈ρ_(Sun)(τ).
선인입수시간t변화적성계중자복조량분포함수ρ_(gal)(t,τ)묘술각연화계단성계s-과정핵소봉도적분포규률.이용성계화학연화적삼성분모형도출성계중자복조량분포함수적연화방정,종이건립성계적중자복조량분포함수ρ_(gal)(t,τ)여AGB성적중자복조량분포함수ρ_(AGB)(τ)지간적관계.취AGB성중자복조량위지수분포,당취t=t_⊙시,득도료태양계적중자복조량분포ρ_(Sun)(τ).
The author introduce a new concept, the distribution function of neutron exposures in the Galaxy ρ_(gal)(t,τ), to study the chemical evolution characteristics of the Galaxy for s-process nuclei. Using the three component model for the chemical evolution of the Galaxy, we get the evolution functions of ρ_(gal)(t,τ) which include the distribution function of neutron exposures in the AGB stars ρ_(AGB)(τ)·At t=t_⊙, we adopt the ρ_(AGB)(τ) as exponential distribution and obtain the distribution function of neutron exposures in the solar system ρ_(Sun)(τ).