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Spectroscopic Study on Cloud Formation of Dust and Molecules In Cool Objects (Brown Dwarfs and Red Giant Stars)

Research Project

Project/Area Number 17540213
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Astronomy
Research InstitutionThe University of Tokyo

Principal Investigator

TAKASHI Tsuji  The University of Tokyo, 大学院・理学系研究科, 名誉教授 (20011546)

Project Period (FY) 2005 – 2008
Project Status Completed (Fiscal Year 2008)
Budget Amount *help
¥3,650,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥450,000)
Fiscal Year 2008: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2007: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2006: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2005: ¥900,000 (Direct Cost: ¥900,000)
Keywords宇宙物理 / 光学赤外線天文学 / 光球大気構造 / 赤外線スペクトル / 赤色巨星 / 成長曲線 / 外層大気構造 / 質量放出 / 褐色矮星 / 化学的非平衡 / 化学組成 / 同位体組成 / 外層構造 / ミクロ乱流モデル / 空間干渉計 / 可視度 / 赤色超巨星 / 分子光球 / 彩層 / 光球 / 超巨星 / 赤外スペクトル / 視線速度 / 動力学特性 / FTS
Research Abstract

We showed that the infrared spectra of red giant and supergiant stars are hybrid of at least two components originating in photosphere and extra molecular condensation (or referred to as Molsphere).
We showed that the infrared spectra of brown dwarfs can be interpreted consistently if we regard the critical temperature, which we introduced as a parameter to represent the thickness of the dust cloud in our UCM (Unified Cloudy Model), to take various values in different objects.

Report

(5 results)
  • 2008 Annual Research Report   Final Research Report ( PDF )
  • 2007 Annual Research Report
  • 2006 Annual Research Report
  • 2005 Annual Research Report
  • Research Products

    (17 results)

All 2009 2008 2007 2006 2005 Other

All Journal Article (11 results) (of which Peer Reviewed: 7 results) Presentation (4 results) Remarks (2 results)

  • [Journal Article] The K giant star Arcturus : the hybrid nature of its infrared spectrum2009

    • Author(s)
      Takashi Tsuji
    • Journal Title

      Astronomy & Astrophysics vol. 504

      Pages: 543-559

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] The K giant star Arcturus : the hybrid nature of its infrared spectrum2009

    • Author(s)
      Takashi Tsuji
    • Journal Title

      Astron.& Astrophys. 504

      Pages: 543-559

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Cool luminous stars : the hybrid nature of their infrared spectra2008

    • Author(s)
      Takashi Tsuji
    • Journal Title

      Astronomy & Astrophysics vol. 489

      Pages: 1271-1289

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Cool luminous stars : the hybrid nature of their infrared spectra2008

    • Author(s)
      Takashi Tsuji
    • Journal Title

      Astron.& Astrophys. 489

      Pages: 1271-1289

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Isotopicc abundances of carbon and oxygen in Oxygen-rich giant stars2007

    • Author(s)
      Takashi Tsuji
    • Journal Title

      Proc. IAU Symp. 239

      Pages: 307-310

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Infrared Spectra and Visibilities as Probes of the Outer Atmospheres of Red Supergiant Stars2006

    • Author(s)
      Takashi Tsuji
    • Journal Title

      Astrophysical Journal vol. 645

      Pages: 1448-1463

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Infrared Spectra and Visibilities as Probes of the Outer Atmospheres of Red Supergiant Stars2006

    • Author(s)
      Takashi Tsuji
    • Journal Title

      The Astrophysical Journal 645

      Pages: 1448-1463

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Dust in the Photospheric Environment III. A Fundamental Element in The Characterization of Ultracool Dwarfs2005

    • Author(s)
      Takashi Tsuji
    • Journal Title

      Astrophysical Journal vol. 621

      Pages: 1033-1048

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Dust in the Photospheric Environment III. A Fundamental Element in the Characterization of Ultracool Dwarfs2005

    • Author(s)
      T.Tsuji
    • Journal Title

      The Astrophysical Journal 621-2

      Pages: 1033-1048

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Interpretation of the Spectra Originating from the Photospheres Contaminated with Dust - Experience in L and T Dwarfs2005

    • Author(s)
      T.Tsuji
    • Journal Title

      Proc.13-th Cambridge Workshop on Cool Stars, Stellar Systems, And the Sun, ESA-SP 560-2

      Pages: 1001-1004

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Forty Years of Spectroscopic Stellar Astrophysics in Japan2005

    • Author(s)
      K.Sadakane, R.Hirata, T.Tsuji
    • Journal Title

      Publ.Astron.Soc.Japan 57-1

      Pages: 1-12

    • NAID

      10023935581

    • Related Report
      2005 Annual Research Report
  • [Presentation] 恒星大気に雲は存在するか?

    • Author(s)
      辻隆
    • Organizer
      日本天文学会2009年秋季年会
    • Place of Presentation
      K型巨星 Arcturus の場合
    • Related Report
      2008 Final Research Report
  • [Presentation] 高分解能FTSスペクトルの定量解析 III : 赤外線スペクトルの複合構造

    • Author(s)
      辻隆
    • Organizer
      日本天文学会2008年秋季年会
    • Related Report
      2008 Final Research Report
  • [Presentation] 高分解能FTSスペクトルの定量解析 II. RGB及びAGB星における炭素及び酸素組成

    • Author(s)
      辻隆
    • Organizer
      日本天文学会2007年秋季年会
    • Related Report
      2008 Final Research Report
  • [Presentation] 空間干渉計データ及び赤外スペクトルによる赤色超巨星MOLSPHERE (分子光球) の最終確認と経験的モデル

    • Author(s)
      辻隆
    • Organizer
      日本天文学会2006年春季年会
    • Related Report
      2008 Final Research Report
  • [Remarks]

    • URL

      http://www.ioa.s.u-tokyo.ac.jp/~ttsuji/export/

    • Related Report
      2008 Final Research Report
  • [Remarks]

    • URL

      http://www.ioa.s.u-tokyo.ac.jp/~ttsuji/export/

    • Related Report
      2008 Annual Research Report

URL: 

Published: 2005-04-01   Modified: 2016-04-21  

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