2013 Fiscal Year Final Research Report
Theoretical study on the formation of metal-poor stars
| Project/Area Number |
21684007
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Astronomy
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| Research Institution | Tohoku University (2012-2013)
Kyoto University (2009-2011) |
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Principal Investigator |
OMUKAI Kazuyuki 東北大学, 理学(系)研究科(研究院), 教授 (70390622)
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| Project Period (FY) |
2009-04-01 – 2013-03-31
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| Keywords | 星形成 / 銀河形成 |
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| Research Abstract |
The first stars in the universe were formed from the primordial pristine gas, made only of hydrogen, helium and trace light elements.How massive were those stars is crucial for subsequent structure formation. Starting from the initial condition obtained by cosmological simulation, we carried out radiation hydrodynamical calculation for the first star formation. We found that when the protostar becomes 40 times more massive than the Sun, the emitted UV radiation becomes so intense that the ambient material is pushed outward, terminating accretion onto the star.The final stellar mass is set at this moment. Although this value of the first star's mass is lower than previously considered by theoretical arguments, it is in accordance with observation of the abundance ratio of low-metallicity stars in the Galactic halo.
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Research Products
(28 results)
