Study of formation and chemical evolution of the Galaxy based on abundance analyses of stars

• Project/Area Number: 17540218
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Astronomy
• Research Institution: Tokai University
• Principal Investigator: HIDAI Masahide Tokai University, 総合教育センター, 教授 (90173179)
• Research Collaborator: OMIYA Masashi 東海大学, 連合大学院, 博士課程後期3 年生 ; KOSUGI Taisei 東海大学, 大学院, 博士課程前期(修士)2 年生
• Project Period (FY): 2005 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥3,790,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥390,000); Fiscal Year 2008: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2007: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2006: ¥600,000 (Direct Cost: ¥600,000); Fiscal Year 2005: ¥1,500,000 (Direct Cost: ¥1,500,000)
• Keywords: 銀河系 / 化学進化 / 金属欠乏星 / 超新星 / ハロー星 / 円盤星 / α元素 / 鉄族元素 / 惑星を持つ恒星 / 亜鉛組成 / 組成解析 / 分光学 / 銀河系化学進化 / 恒星 / 化学組成 / 系外惑星 / スペクトル / 恒星分光学 / 恒星種族II / 核合成 / 金属富裕星

Research Abstract

銀河系の形成・化学進化について、年齢の古い星を中心に、星表面の元素組成解析から調べた。 太陽の約40 万分の1 しか鉄が含まれていない銀河系初期の恒星が発見され、その元素の起源は極新星などによるものと解釈された。また硫黄や亜鉛などの解析から、銀河系初期には大質量星の極新星や超新星が発生しやすく、これらがいろいろな元素の振る舞いを決めていることが判明した。時間が経過すると、鉄を多く作る超新星が発生することで、銀河系の化学進化が支配されることも分かった。

Research Products

• [Journal Article] A massive substellar companion to the massive giant HD 119445 (2009)
  • Author(s): M. Omiya, H. Izumiura, +11 authors (13番目)
  • Journal Title: PASJ 61(印刷中) Pages: 0-0
  • NAID: 10025600844
  • Peer Reviewed
• [Journal Article] Chemical evolution of zinc in the Galaxy (2009)
  • Author(s): Y.-j. Saito, M. Takada-Hidai, S. Honda, Y. Takeda
  • Journal Title: PASJ 61(印刷中) Pages: 0-0
  • Peer Reviewed
• [Journal Article] Chemical Evolution of Zinc in the Galaxy (2009)
  • Author(s): Y. Saito, M. Takada-Hidai, et al.
  • Journal Title: Publ. Astron. Soc. Japan 61(In press)
  • Peer Reviewed
• [Journal Article] Evidence for a Companion to BM Gem, a Silicate Carbon Star (2008)
  • Author(s): H. Izumiura, K. Noguchi, W. Aoki, S.Honda, H. Ando, M. Takada-Hidai, +9 authors
  • Journal Title: ApJ 682 Pages: 499-508
  • Peer Reviewed
• [Journal Article] Evidence for a Companion to BM Gem, a Silicate Carbon Star (2008)
  • Author(s): Hideyuki Izumiura, et al.
  • Journal Title: Astrophysical Journal 682 Pages: 499-508
  • Peer Reviewed
• [Journal Article] Spectroscopic Studies of Extremely Metal-poor Stars with the Subaru High-Dispersion Spectrograph. IV. The α-Element-Enhanced Metal-poor Star BS 16934-002 (2007)
  • Author(s): W. Aoki, S. Honda, T.C. Beers, M.Takada-Hidai, + 6 authors
  • Journal Title: ApJ 660 Pages: 747-761
  • Peer Reviewed
• [Journal Article] Non-LTE line formation for heavy elements in four very metal-poor stars (2007)
  • Author(s): Mashonkina, L, et. al.
  • Journal Title: Astronomy & Astrophysics 478 Pages: 529-541
  • Peer Reviewed
• [Journal Article] Spectroscopic Studies of Extremely Metal-poor Stars with the Subaru High-Dispersion Spectrograph.IV.The α-Element-Enhanced Metal-poor Star BS 16934-002 (2007)
  • Author(s): Aoki, W., S.Honda, T.C.Beers, M.Takada-Hidai, et. al.
  • Journal Title: Astrophysical Journal 660 Pages: 747-761
  • Peer Reviewed
• [Journal Article] Chemical Abundance Analysis of the Extremely Metal-poor Star HE 1300+0157 (2007)
  • Author(s): Frebel, A. et al.
  • Journal Title: ApJ. 658 Pages: 534-552
• [Journal Article] Chemical Abundance Analysis of the Extremely Metal-poor Star HE1300+0157 (2006)
  • Author(s): A. Frebel, J.N. Norris,W. Aoki, S. Honda, M.S. Bessell, M.Takada-Hidai, + 2 authors
  • Journal Title: ApJ 658 Pages: 534-552
  • Peer Reviewed
• [Journal Article] Chemical Evolution of Sulfur in the Metallicity Range of -4<[Fe/H]<+0.5 (2006)
  • Author(s): Takada-Hidai, M. et al.
  • Journal Title: American Insti. Physics Conf. 847 Pages: 482-482
• [Journal Article] Zinc Abundances in Metal-Poor Stars (2006)
  • Author(s): Saito, Y.-J., Takada-Hidai, M.et al.
  • Journal Title: American Insti. Physics Conf. 847 Pages: 464-464
• [Journal Article] Chemical Abundances in the Secondary Star of the Black Hole Binary V4641 Sagittarii (SAX J1819.3-2525) (2006)
  • Author(s): Sadakane, K. et al.
  • Journal Title: PASJ 58 Pages: 595-604
• [Journal Article] On the Spectroscopic Determination of Atmospheric parameters And O/Fe Abundances of RR Lyrae Starts (2006)
  • Author(s): Takeda, Y. et al.
  • Journal Title: PASJ 58 Pages: 389-406
• [Journal Article] HE 1327-2326, An Unevolved Star with [Fe/H] -5.0. I. A Comprehensive Abundance Analysis (2005)
  • Author(s): W. Aoki, A. Frebel, N.C. + 18 authors (9 番目)
  • Journal Title: ApJ 639 Pages: 897-917
  • Peer Reviewed
• [Journal Article] Nucleosynthetic signatures of the first stars (2005)
  • Author(s): A. Frebel, W. Aoki, + 17 authors (17番目)
  • Journal Title: Nature 434 Pages: 871-873
  • Peer Reviewed
• [Journal Article] Sulfur Abundances in Metal-Poor Stars Based on OAO-1.88m/HIDES Spectra (2005)
  • Author(s): M. Takada-Hidai, Y.-j. Saito, + 5 atuhors
  • Journal Title: PASJ 57 Pages: 347-363
  • Peer Reviewed
• [Journal Article] Behavior of sulfur in extremely metal-poor stars (2005)
  • Author(s): M.Takada-Hidai
  • Journal Title: From Lithium to Uranium : Elemental Tracers of Early Cosmic Evolution, Proc.IAU Symp.228 Pages: 277-278
• [Journal Article] Chemical abundance patterns of extremely metal-poor stars with [Fe/H]<-3.5 (2005)
  • Author(s): W.Aoki
  • Journal Title: From Lithium to Uranium : Elemental Tracers of Early Cosmic Evolution, Proc.IAU Symp.228 Pages: 195-200
• [Journal Article] The new record holder for the most iron-poor star : HE1327-2326, a dwarf or subgiant with [Fe/H]=-5.4 (2005)
  • Author(s): A.Frebel
  • Journal Title: From Lithium to Uranium : Elemental Tracers of Early Cosmic Evolution, Proc.IAU Symp.228 Pages: 207-212
• [Presentation] G型巨星における惑星系の日韓共同探査. V (2009)
  • Author(s): 大宮正士, 他(比田井昌英)
  • Organizer: 日本天文学会春季年会
  • Place of Presentation: 大阪府立大学
  • Year and Date: 2009-03-26
• [Presentation] 惑星を持っ星におけるLi組成の振る舞い (2009)
  • Author(s): 比田井昌英, 他
  • Organizer: 日本天文学会春季年会
  • Place of Presentation: 大阪府立大学
  • Year and Date: 2009-03-25
• [Presentation] 銀河系における亜鉛の化学進化 (2008)
  • Author(s): 比田井昌英
  • Organizer: 日本天文学会
  • Place of Presentation: 岡山理科大学
  • Year and Date: 2008-09-11
• [Presentation] 銀河系における亜鉛の化学進化 (2008)
  • Author(s): 比田井 昌英, 他
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 岡山理科大学
  • Year and Date: 2008-09-11
• [Presentation] 惑星を持っ星の軽元素と鉄族元素の振る舞い : HDSデータ解析 (2008)
  • Author(s): 小杉泰生, (比田井昌英)
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 岡山理科大学
  • Year and Date: 2008-09-11
• [Presentation] 惑星を持つ星における軽元素と鉄族元素の振る舞い (2008)
  • Author(s): 比田井 昌英
  • Organizer: 日本天文学会
  • Place of Presentation: オリンピック記念 青少年総合センター
  • Year and Date: 2008-03-27
• [Presentation] 亜鉛過剰な超金属欠乏星は極超新星によるものか? (2007)
  • Author(s): 本田敏志
  • Organizer: 日本天文学会
  • Place of Presentation: 岐阜大学
  • Year and Date: 2007-09-28
• [Presentation] 惑星を持つ星の軽元素の振る舞い: C,O,Na,Al の解析 (2007)
  • Author(s): 比田井昌英
  • Organizer: 日本天文学会
  • Place of Presentation: 岐阜大学
  • Year and Date: 2007-09-26
• [Presentation] 惑星を持っ星における軽元素と鉄族元素の振る舞い (2007)
  • Author(s): 比田井 昌英
  • Organizer: 日本天文学会
  • Place of Presentation: 岐阜大学
  • Year and Date: 2007-09-26
• [Presentation] 惑星を持つ星のアルファ元素と鉄族元素の振る舞い(II): Si, Ca, Ti, Ni, Cu の解析 (2007)
  • Author(s): 比田井昌英
  • Organizer: 日本天文学会
  • Place of Presentation: 東海大学
  • Year and Date: 2007-03-30
• [Presentation] 銀河系の硫黄と亜鉛の化学進化(IV): -4<[Fe/H]<+0.5の領域における硫黄の化学進化 (2005)
  • Author(s): 比田井昌英
  • Organizer: 日本天文学会
  • Year and Date: 2005-10-07