2021 Fiscal Year Final Research Report
A study on the early history of star and binary formation and the Galaxy formation through the analysis of carbon-enhanced, metal-poor stars in the Galactic halo
| Project/Area Number |
19K03931
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 16010:Astronomy-related
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 宇宙最初の星 / 超金属欠乏星 / 漸近巨星分枝星 / 恒星進化 / 星風・質量放出 / 星・連星系形成 / 核種合成過程 / 銀河系形成史 |
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| Outline of Final Research Achievements |
The existence of extremely metal-poor (EMP) stars and their characteristics has been revealed through recent large-scaled surveys and high dispersion spectroscopic observations with large telescopes such as Subaru. In this study, we explore the origin of these EMP stars from the peculiarities imprinted on their surface abundances and their statistical properties, and on the basis, investigate the star and binary formation processes in the early Universe under the EMP conditions. We also construct the theory of the evolution and nucleosynthesis of stars, in particular of Asymptotic giant branch stars, and the star and binary formation, which are necessary for understanding the observations. Thus, we can derive a new picture on the structure formation history and the origin of elements in the early Universe initiated by the Big Bang.
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| Free Research Field |
天体物理学
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| Academic Significance and Societal Importance of the Research Achievements |
宇宙の曙光とそれに続く恒星がどのように誕生し、初期宇宙の物質進化、構造形成でどのような役割を果たしてきたかを明らかにすることは、観測的にも理論的にも、現在の天文学の焦点の一つである。宇宙初期に誕生した恒星の痕跡を情報源ととして、宇宙初期における星形成、構造形成過程を探る分野は near field cosmology と呼ばれ、今世紀になって8m級の望遠鏡での観測の進展を受けて活発に展開している。本研究は、超新星で金属を生成放出する大質量星ではなく、漸近巨星分枝星に注目した点が新しく、それによって、これまでの研究にはなかった、新たな側面を明らかにすることができた。
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