观测结果对三成分多分量星系化学演化模型的约束  

The Observational Constraints to the Multiphase, Three-Zone Chemical Evolution Model for Galaxies

作　　者：宋汉峰[1] 吴海滨[1] 张波[1] 

机构地区：[1]河北师范大学物理系,石家庄050016

出　　处：《云南天文台台刊》2003年第3期1-15,共15页Publications of the Yunnan Observatoty

基　　金：国家自然科学基金资助项目(19973002).

摘　　要：本文是在银河系化学演化的基础上,利用银河系的三成分(threezone)(即晕、厚盘和薄盘)多相(multi phase)(气体,分子云,大、小质量恒星以及剩余物质)的化学演化的理论模型,讨论了以下观测约束:1、质量面密度、恒星形成率,各分区质量比;2、场星的年龄-金属丰度关系;3、α元素化学演化;4、太阳附近G矮星金属丰度分布;5、三成分金属丰度特征量;6、超新星爆发率;7、内落速率。结果表明,三成分多分量模型能够较好地满足观测约束,比较真实地反映星系演化过程。可以用该模型计算元素的星系化学演化。On the basis of the Galaxy evolution theory, We use the therotical chemical evolution model of threezone (the halo, thick disk and thin disk) and multiphase (the diffuse gas, molecular clouds, stars of both low and high mass, the remnants) to discuss the fowllowing observational constraints: (1)surface densities and SFR, (2)agemetallicity relation,(3) and , (4)Gdwarf metallicity distribution in the solar neighbourhood, (5)Characteristic properties of the galactic components, (6)supernova rates and (7)infall rate. We conclude that the three zone and multiphase model can consistent with all constraints above. We can use this model to cauculate the elements of the galaxy evolution.

关 键 词：银河系 化学演化 场星年龄 超新星爆发 观测约束 元素丰度 

分 类 号：P15[天文地球—天文学] O141.4[理学—数学]