A study of the evolution of asymptotic branch stars from the dawn of Universe to the present day.
| Project/Area Number |
25400233
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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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| Research Field |
Astronomy
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| Research Institution | Hokkai-Gakuen University |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
KOZASA Takashi 北海道大学, 理学研究院, 教授 (90263368)
SUDA Takuma 東京大学, 理学系研究科, 特任助教 (90374735)
KOMIYA Yutaka 東京大学, 理学系研究科, 特任研究員 (10455777)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2013: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | 恒星進化 / 核種合成過程 / 宇宙初代星 / 銀河系形成史 / 元素の起源 / 漸近巨星分枝星 / 炭素星 / 質量放出 / 銀河形成史 / 初代星 / 恒星の回転 / s-過程元素合成 / 物質混合 |
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| Outline of Final Research Achievements |
Recently, a number of extremely metal-poor stars have been observed, among which, a significant fraction of stars show peculiar abundances patterns, enriched with carbon and with heavy elements, synthesized via slow-process of neutron captures in asymptotic giant branch (ABG) stars and via rapid-process in some explosive events.
We study the evolutionary characteristics of AGM stars in particular of s-process in them systematically and by applying the theoretical results, we explore the formation mechanisms of carbon enhanced stars and the origins of neutron capture elements, either via slow- and/or rapid-processes under the environment of extremely metal deficiency in the early Universe. From these analyses, we reveal new aspects of star formation during early evolution of Milky Way and even preceding it and the properties of stars survive to date in the Galactic halo, which also gives a new insight into the search for the first stars in our Universe.
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Report
(4 results)
Research Products
(29 results)
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[Journal Article] Transition of the stellar initial mass function explored using binary population synthesis2013
Author(s)
Suda, T., Komiya, Y., Yamada, S., Katsuta, Y., Aoki, W., Gil-Pons, P., Doherty, C. L., Campbell, S. W., Wood, P. R., Fujimoto, M. Y.
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Journal Title
Monthly Notices of the Royal Astronomical Society: Letters
Volume: 432
Issue: 1
Pages: 46-50
DOI
Related Report
Peer Reviewed
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[Presentation] SAGAデータベースを用いた銀河の化学進化の検証2016
Author(s)
須田拓馬, 小宮悠, 大谷友香理, 増山美優, 野田和弘(東京大学), 日高潤(明星大学), 勝田豊, 山田 志真子(北海道大学), 青木和光(国立天文台), 藤本正行(北海学園大学)
Organizer
日本天文学会2016年春季年会
Place of Presentation
首都大学東京 南大沢キャンパス（東京都八王子市
Year and Date
2016-03-14
Related Report
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[Presentation] 矮小銀河中の恒星のデータベース(2)2015
Author(s)
須田拓馬, 大谷友香理, 野田和弘, 増山美優(東京大学), 日高潤(明星大学), 勝田豊(北海道大学), 青木和光(国立天文台), 藤本正行(北海学園大学)
Organizer
日本天文学会2015年秋季年会
Place of Presentation
甲南大学
Year and Date
2015-09-09
Related Report
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[Presentation] 2Mの最大質量を満足する高密度星の熱的進化モデル2015
Author(s)
野田常雄(久留米工業大学), 安武伸俊(千葉工業大学), 橋本正章(九州大学), 丸山敏毅(原子力機 構), 巽敏隆(京都大学), 藤本正行(北海学園大学)
Organizer
日本天文学会2015年秋季年会
Place of Presentation
甲南大学
Year and Date
2015-09-09
Related Report
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