银河系金属丰度及其演化研究新进展
张华伟1,2,3 赵 刚2
(1. 北京大学地球物理系 北京 100871)
(2. 中国科学院北京天文台 北京 100012)
(3. 中国科学院－北京大学联合北京天体物理中心 北京 100871)
摘 要
银河系的银盘、银晕、核球的平均金属丰度为-0.2，-1.6，-0.2。
年龄--金属丰度关系给出了银河系形成和演化的线索。为了解释观
测的年龄--金属丰度关系及其弥散，银河系化学演化模型必须考虑
恒星轨道运动、非瞬时混合等机制。
New Progress in Galactic Metallicity and its Evolution
Zhang Huawei1,2,3 Zhao Gang2
(1. Department of Geophysics, Peking University, Beijing
100871)
(2. Beijing Astronomical Observatory, Chinese
Academy of Sciences, Beijing 100012)
(3. Beijing Astrophysics Center, jointly sponsored by the Chinese Academy of
Sciences and Peking University, Beijing 100871)
Abstract
The average values of metallicity in the disk, the halo, and
Galactic bulge are -0.2, -1.6, and -0.2 dex respectively. The
age-metallicity relation (AMR) provides useful clues about the
Galactic formation and evolution. In order to explain observed
AMR and its scatter, mechanisms of diffusion of stellar orbits
and non-instantaneous mixing must be considered in Galactic
chemical evolution models.
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