| 太阳附近G矮星金属含量分布和化学演化 |
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| 引用本文： | 常瑞香,侯金良,傅承启.太阳附近G矮星金属含量分布和化学演化[J].中国天文和天体物理学报,1998(4). |
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| 作者姓名： | 常瑞香 侯金良 傅承启 |
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| 作者单位： | 中国科学院上海天文台，中国科学院北京天文台青年中心 |
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| 基金项目： | 国家自然科学基金,上海天文台青年实验室资助 |
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| 摘 要： | 利用新的太阳附近２５ｐｃ内的Ｇ矮星金属含量分布函数，本文在假定星际介质丰度非均匀情况下，讨论了四种化学演化模型的合理性．结果表明，简单模型和坍缩模型与实际情况相差较大，而ＰＩＥ模型和ＰＰＹ模型不仅对金属含量分布函数拟合较好，而且传统的Ｇ矮星问题也可以得到解释．这表明太阳附近可能受银晕影响较小．
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| 关 键 词： | 恒星 G矮星 金属含量 太阳附近 化学演化模型 |
G Dwarfs Metallicity Distribution in the Solar Neighbourhood and the Chemical Evolution |
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| CHANG Rui-xiang HOU Jin-liang , FU Cheng-qi.G Dwarfs Metallicity Distribution in the Solar Neighbourhood and the Chemical Evolution[J].Chinese Journal of Astronomy and Astrophysics,1998(4). |
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| Authors: | CHANG Rui-xiang HOU Jin-liang FU Cheng-qi |
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| Institution: | CHANG Rui-xiang 1 HOU Jin-liang 1,2 FU Cheng-qi 1 1 |
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| Abstract: | Based on a new G dwarfs metallicity distribution function within the solar distance of 25pc, the present study gives a detailed discussion for four galactic chemical evolution models in an inhomogeneous interstellar medium. It is shown that both the simple and the collapse models deviate greatly from the observed results, while the PIE and PPY models not only give much better fit, but also alleviate the classical G dwarf problem. The indication is that the outer halo materials might have little influence in the solar neighbourhood. |
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