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A study of the evolution of asymptotic branch stars from the dawn of Universe to the present day.

Research Project

Project/Area Number 25400233
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Astronomy
Research InstitutionHokkai-Gakuen University

Principal Investigator

Fujimoto Masayuki  北海学園大学, 工学部, 研究員 (00111708)

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)
Project Period (FY) 2013-04-01 – 2016-03-31
Project Status Completed (Fiscal Year 2015)
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)
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
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.

Report

(4 results)
  • 2015 Annual Research Report   Final Research Report ( PDF )
  • 2014 Research-status Report
  • 2013 Research-status Report
  • Research Products

    (29 results)

All 2016 2015 2014 2013

All Journal Article (8 results) (of which Peer Reviewed: 7 results,  Open Access: 4 results,  Acknowledgement Compliant: 4 results) Presentation (21 results)

  • [Journal Article] Population III Stars Around the Milky Way2016

    • Author(s)
      Komiya, Y., Suda, T., Fujimoto, M. Y.
    • Journal Title

      Astrophysical Journal

      Volume: 820 Issue: 1 Pages: 59-59

    • DOI

      10.3847/0004-637x/820/1/59

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] The Most Iron-deficient Stars as the Polluted Population III Stars2015

    • Author(s)
      Komiya, Y. Suda, T., Fujimoto, M. Y.
    • Journal Title

      Astrophysical Journal Letters

      Volume: 808 Issue: 2 Pages: L47-L47

    • DOI

      10.1088/2041-8205/808/2/l47

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Numerical Experiments for Nucler Flashes toward Superbursts in an Accreting Neutron Star2014

    • Author(s)
      M.Hashimoto, R.Kuromizu,M. Ono,T. Noda, M. Fujimoto
    • Journal Title

      Journal of Astrophysics

      Volume: 2014 Pages: 1-12

    • DOI

      10.1155/2014/817986

    • Related Report
      2014 Research-status Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Analysis of enrichment histories for elements and two modes of star formation during the early evolution of Milky Way2014

    • Author(s)
      Yamada, S., Suda, T., Komiya, Y., Aoki, W., Fujimoto, M. Y.
    • Journal Title

      AIP Conference Proceedings (proceedings of ICNAAM-2014)

      Volume: 1594 Pages: 93-98

    • DOI

      10.1063/1.4874051

    • Related Report
      2014 Research-status Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] The New Model of Chemical Evolution of r-process Elements Based on the Hierarchical Galaxy Formation. I. Ba and Eu2014

    • Author(s)
      Komiya, Y., Yamada, S., Suda, T., Fujimoto, M. Y.
    • Journal Title

      The Astrophysical Journal

      Volume: 783 Issue: 2 Pages: 132-153

    • DOI

      10.1088/0004-637x/783/2/132

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Journal Article] The Stellar Abundances for Galactic Archaeology (SAGA) Database - III. Analysis of enrichment histories for elements and two modes of star formation during the early evolution of the Milky Way2013

    • Author(s)
      Yamada, S., Suda, T., Komiya, Y., Aoki, W., Fujimoto, M. Y.
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 436 Issue: 2 Pages: 1362-1380

    • DOI

      10.1093/mnras/stt1652

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [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.
    • Journal Title

      Monthly Notices of the Royal Astronomical Society: Letters

      Volume: 432 Issue: 1 Pages: 46-50

    • DOI

      10.1093/mnrasl/slt033

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Journal Article] The stellar initial mass function in the early universe revealed from old stellar populations in our neighbourhood2013

    • Author(s)
      The stellar initial mass function in the early universe revealed from old stellar populations in our neighbourhood
    • Journal Title

      The stellar initial mass function in the early universe revealed from old stellar populations in our neighbourhood

      Volume: 295 Issue: S295 Pages: 322-322

    • DOI

      10.1017/s1743921313005243

    • Related Report
      2013 Research-status Report
  • [Presentation] 連星中性子星合体によるr プロセス元素の化学進化2016

    • Author(s)
      小宮 悠、茂山俊和(東京大学)、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
      2015 Annual Research Report
  • [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
      2015 Annual Research Report
  • [Presentation] 銀河系ハロー:炭素過剰星の起源と星形成史2015

    • Author(s)
      藤本正行(北海学園大学/北海道大学), 山田志真子 (北海道大学), 須田拓馬, 小宮悠 (東京大学)
    • Organizer
      初代星・初代銀河研究会
    • Place of Presentation
      群馬大学草津セミナーハウス
    • Year and Date
      2015-11-30
    • Related Report
      2015 Annual Research Report
  • [Presentation] s-過程核種合成と炭素過多金属欠乏(CEMP) 星形成の統一的描像2015

    • Author(s)
      山田志真子(北海道大学), 須田拓馬, 小宮悠(東京大学), 藤本正行(北海道大学, 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
      2015 Annual Research Report
  • [Presentation] 階層的化学進化モデルによるr過程元素の中性子星連星起源説の検証2015

    • Author(s)
      小宮 悠、茂山俊和(東京大学)、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
      2015 Annual Research Report
  • [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
      2015 Annual Research Report
  • [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
      2015 Annual Research Report
  • [Presentation] 恒星の自転の進化–質量および進化段階への依存性2015

    • Author(s)
      勝田豊, 岡崎敦男, 須田拓馬, 藤本正行
    • Organizer
      日本天文学会
    • Place of Presentation
      大阪大学
    • Year and Date
      2015-03-18 – 2015-03-21
    • Related Report
      2014 Research-status Report
  • [Presentation] 球状星団における元素組成異常と水平分枝形状の起源(2)2015

    • Author(s)
      須田拓馬, 茂山俊和, 辻本拓司, 谷川衝, 藤本正行
    • Organizer
      日本天文学会
    • Place of Presentation
      大阪大学
    • Year and Date
      2015-03-18 – 2015-03-21
    • Related Report
      2014 Research-status Report
  • [Presentation] 超金属欠乏AGB星での中性子捕獲を伴う核種合成過程とHyper Metalpoor stars (II)2015

    • Author(s)
      山田志真子, 須田拓馬, 小宮悠, 藤本正行
    • Organizer
      日本天文学会
    • Place of Presentation
      大阪大学
    • Year and Date
      2015-03-18 – 2015-03-21
    • Related Report
      2014 Research-status Report
  • [Presentation] 銀河系における種族III 星発見にむけて2015

    • Author(s)
      小宮 悠、須田拓馬、藤本正行
    • Organizer
      日本天文学会
    • Place of Presentation
      大阪大学
    • Year and Date
      2015-03-18 – 2015-03-21
    • Related Report
      2014 Research-status Report
  • [Presentation] 恒星の進化に伴うdifferential rotation の生成と成長2014

    • Author(s)
      勝田豊, 岡崎敦男, 須田拓馬, 藤本正行
    • Organizer
      日本天文学会
    • Place of Presentation
      山形大学
    • Year and Date
      2014-09-11 – 2014-09-13
    • Related Report
      2014 Research-status Report
  • [Presentation] 金属欠乏星における表面汚染とhyper metal-poor stars2014

    • Author(s)
      小宮悠, 須田拓馬, 山田志真子, 藤本正行
    • Organizer
      日本天文学会
    • Place of Presentation
      山形大学
    • Year and Date
      2014-09-11 – 2014-09-13
    • Related Report
      2014 Research-status Report
  • [Presentation] 超金属欠乏AGB星での中性子捕獲を伴う核種合成過程とHyper Metalpoor stars2014

    • Author(s)
      山田志真子, 須田拓馬, 小宮悠, 藤本正行
    • Organizer
      日本天文学会
    • Place of Presentation
      山形大学
    • Year and Date
      2014-09-11 – 2014-09-13
    • Related Report
      2014 Research-status Report
  • [Presentation] 連星仮説に基づく超金属欠乏星の起源とHyper Metal-Poor Stars2014

    • Author(s)
      須田拓馬,小宮悠, 山田志真子, 藤本正行
    • Organizer
      日本天文学会
    • Place of Presentation
      山形大学
    • Year and Date
      2014-09-11 – 2014-09-13
    • Related Report
      2014 Research-status Report
  • [Presentation] 恒星の回転について2014

    • Author(s)
      藤本正行、勝田豊、岡崎敦男、須田拓馬
    • Organizer
      初代星•初代銀河研究会
    • Place of Presentation
      鹿児島大学、鹿児島
    • Related Report
      2013 Research-status Report
  • [Presentation] 恒星の自転の進化 II --- 慣性モーメントの変動の金属量依存性2014

    • Author(s)
      勝田豊,岡崎敦男,須田拓馬,藤本正行
    • Organizer
      日本天文学会2014年春季年会
    • Place of Presentation
      国際基督教大学、東京
    • Related Report
      2013 Research-status Report
  • [Presentation] Analysis of Enrichment Histories for Elements among the different Galactic Components during the Early Evolution of Milky Way2014

    • Author(s)
      山田志真子、須田拓馬、小宮悠、藤本正行
    • Organizer
      日本天文学会2014年春季年会
    • Place of Presentation
      国際基督教大学、東京
    • Related Report
      2013 Research-status Report
  • [Presentation] Current signatures and search for Pop. III stars in the Local Universe2013

    • Author(s)
      Komiya, Yutaka; Suda, Takuma; Fujimoto, Masayuki
    • Organizer
      EWASS 2013 Symposium 5: Local Group, Local Cosmology
    • Place of Presentation
      Turku, Finland
    • Related Report
      2013 Research-status Report
  • [Presentation] The Evolution of Stellar Rotation and the Origin of Be Stars2013

    • Author(s)
      Katsuta, Yutaka; Okazaki, Atsuo T.; Fujimoto, Masayuki Y
    • Organizer
      Massive Stars: From α to Ω
    • Place of Presentation
      Rhodes, Greece
    • Related Report
      2013 Research-status Report
  • [Presentation] 恒星の自転の進化 --- 慣性モーメントの変動とBe星の起源2013

    • Author(s)
      勝田豊,岡崎敦男,須田拓馬,藤本正行
    • Organizer
      日本天文学会2013年秋季年会
    • Place of Presentation
      東北大学、仙台
    • Related Report
      2013 Research-status Report

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Published: 2014-07-25   Modified: 2019-07-29  

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