Enrichment history of r-process elements in the Galactic halo and dwarf galaxies
| Project/Area Number |
21540244
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Astronomy
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| Research Institution | International Christian University |
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Principal Investigator |
ISHIMARU Yuri 国際基督教大学, 教養学部, 准教授 (90397068)
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| Project Period (FY) |
2009-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2013: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2012: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2011: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2010: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2009: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | 理論天体物理学 / 銀河系 / 化学進化 / 金属欠乏星 / 矮小銀河 / ｒプロセス / 超新星爆発 / 中性子星 / 銀河の化学進化 / rプロセス / 中性子星合体 / 元素合成 |
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| Research Abstract |
Rapid neutron-capture process (r-process) produces most elements heavier than iron. Recent nucleosynthesis studies have pointed out serious difficulties for supernovae as a candidate of the r-process site. The other strong candidate is a neutron star merger. However, it has been suggested that neutron star mergers could not explain observed enhancement of r-process elements in metal-poor stars because the timescale of merger is regarded to be too long as 100 Myrs. In this study, using a new chemical evolution model, we have shown that neutron star mergers could reproduce observational abundances of metal-poor stars if the Galactic halo were formed from clusterings of sub-halos with various star formation histories. This result strongly supports neutron star mergers as the r-process site.
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Report
(6 results)
Research Products
(43 results)
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[Journal Article] Constraints on the weak r-process : Abundance of Palladium in metal poor stars2010
Author(s)
François, P., Wanajo, S., Prantzos, N., James, G., Ishimaru, Y., Aoki, W., & Honda, S
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Journal Title
Proceedings of the 11th Symposium on Nuclei in the Cosmos, PoS(NIC XI)
Volume: 264
Pages: 4-4
URL
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Peer Reviewed
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[Presentation] Constraints on the weak r-process : Abundance of Palladium in metal poor stars2010
Author(s)
François, P., Wanajo, S., Prantzos, N., James, G., Ishimaru, Y., Aoki, W., & Honda, S
Organizer
11th Symposium on Nuclei in the Cosmos (NIC XI)
Place of Presentation
Heidelberg, Germany
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