| Project/Area Number |
25800115
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Astronomy
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| Research Institution | The University of Tokyo (2014)
National Astronomical Observatory of Japan (2013) |
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Principal Investigator |
KOMIYA Yutaka 東京大学, 理学(系)研究科(研究院), 研究員 (10455777)
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
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| Keywords | 金属欠乏星 / 初代星 / 元素合成 / ｒ過程 / Hyper metal-poor star / 化学進化 / r過程元素 / 銀河形成 / 銀河系ハロー / 矮小銀河 |
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| Outline of Final Research Achievements |
Metal (elements heavier than lithium) were not synthesized in the Big Bang nucleosynthesis but formed in the stellar interior or at supernova explosion. Metal-poor stars are relics from the early Universe. We model the enrichment history of heavy elements in the early Universe considering hierarchical galaxy formation.
We investigate the enrichment history of r-process elements. The r-process is a process to synthesize elements heavier than iron-group. It is known that the r-process element abundances of metal-poor stars show large scatter. We successfully reproduce the observed distribution of r-process element abundances by considering the hierarchical galaxy formation process.
We also show that hyper metal-poor stars, which are the most iron-deficient stars ever identified, were formed without metal. The surface pollution by accretion of interstellar medium can account for the surface metal abundance of hyper metal-poor stars.
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