| Project/Area Number |
20740114
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Astronomy
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| Research Institution | National Astronomical Observatory of Japan |
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Principal Investigator |
AOKI Wakou National Astronomical Observatory of Japan, 光赤外研究部, 助教 (20321581)
|
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| Project Period (FY) |
2008 – 2009
|
| Project Status |
Completed (Fiscal Year 2009)
|
| Budget Amount *help |
¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2009: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2008: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
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| Keywords | 元素合成 / 超新星爆発 / 低金属星 / 銀河系 / 分光観測 / 超新星 / 恒星大気 |
|---|
| Research Abstract |
Chemical abundances of the heaviest elements Thorium and Lead have been measured for Galactic stars to investigate the contributions of the neutron-capture processes that yields elements heavier than iron. Observations are extended to the metallicity range that has not well studied by previous work. We revealed that contributions of the explosive synthesis of heavy elements (the r-process) are dominant in the Galactic halo and thick disk structures, and also found a decreasing trend of scatter in abundance ratios between Thorium and other heavy elements with increasing metallicity.
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