基本信息
浏览量:43
职业迁徙
个人简介
The world we know, including our bodies, is constructed from the chemical elements, most of which were produced by nuclear reactions in the interiors of stars. When a star dies a fraction of the elements synthesized during the star's lifetime is released into the inter-stellar gas clouds, out of which successive generations of stars form. Astronomers have a basic understanding of this chemical enrichment cycle, but chemical evolution and nulceosynthesis are still not fully understood. Red Giant stars preserve much of their original chemical composition in their outer envelopes, and can have ages up to the age of the Galaxy; thus their compositions comprise a fossil record of chemical evolution. Andrew McWilliam measures the detailed chemical composition of Red Giant stars to answer questions such as: What are the sites of nucleosynthesis? What physical conditions modulate element production? What can be learned about galactic history by reading the fossil record?
To test nucleosynthesis and chemical evolution theory, McWilliam is studying the composition of Red Giant stars in systems with a variety of characteristics. The central bulge of our Galaxy, for instance, probably evolved quickly and was the destination for infalling gas. Dwarf galaxies likely evolved slowly and lost much of their initial gas. Thus, the bulge composition should reflect nucleosynthesis by short-lived stars, whilst the Sagittarius dwarf galaxy should show abundance patterns characteristic of long-lived stars.These expectations have been verified by McWilliam and colleagues; although these two systems displayed more complexity than anticipated.
To test nucleosynthesis and chemical evolution theory, McWilliam is studying the composition of Red Giant stars in systems with a variety of characteristics. The central bulge of our Galaxy, for instance, probably evolved quickly and was the destination for infalling gas. Dwarf galaxies likely evolved slowly and lost much of their initial gas. Thus, the bulge composition should reflect nucleosynthesis by short-lived stars, whilst the Sagittarius dwarf galaxy should show abundance patterns characteristic of long-lived stars.These expectations have been verified by McWilliam and colleagues; although these two systems displayed more complexity than anticipated.
研究兴趣
论文共 106 篇作者统计合作学者相似作者
按年份排序按引用量排序主题筛选期刊级别筛选合作者筛选合作机构筛选
时间
引用量
主题
期刊级别
合作者
合作机构
Noriyuki Matsunaga,Daisuke Taniguchi, Scarlet S. Elgueta,Takuji Tsujimoto,Junichi Baba,Andrew Mcwilliam,Shogo Otsubo,Yuki Sarugaku, Tomomi Takeuchi, Haruki Katoh,Satoshi Hamano,Yuji Ikeda,
ASTROPHYSICAL JOURNALno. 2 (2023): 198-198
加载更多
作者统计
合作学者
合作机构
D-Core
- 合作者
- 学生
- 导师
数据免责声明
页面数据均来自互联网公开来源、合作出版商和通过AI技术自动分析结果,我们不对页面数据的有效性、准确性、正确性、可靠性、完整性和及时性做出任何承诺和保证。若有疑问,可以通过电子邮件方式联系我们:report@aminer.cn