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Study of the evolution of the structure of circumstellar dust envelopes based on the observations of infrared spectra

Research Project

Project/Area Number 06640350
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Astronomy
Research InstitutionNagoya University

Principal Investigator

NOGUSHI Kunio  National Astronomical Observatory, Division of Optical and Infrared Astronomy, Associate Professor, 理学部, 助教授 (10111824)

Co-Investigator(Kenkyū-buntansha) SATO Shuji  Nagoya Unibersity, School of Science, Professor, 理学部, 教授 (50025483)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1995: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1994: ¥1,300,000 (Direct Cost: ¥1,300,000)
KeywordsObservations of Infrared spectra / Evolution of AGB stars / Circumstellar dust
Research Abstract

The scientific objective of this project is to clarify the evolution of asymptotic giant branch (AGB) stars by investigating the relation between evolutionary stages and the structure of circumstellar dust envelopes (CDE). At the beginning of this project, we consicered that it is very important to trace the evolutionary change of the structure of CDE observationally. Thus we observed variety of AGB stars with CDE in the near-infrared (NIR) wavelength region. As this observational results, we found that the space distribution of carbon stars (one kind of AGB stars) is likely to be different from that of O-rich AGB stars with thickCDE.This result indicate that the evolutionary process of AGB stars may depend on the location in the Galaxy caused by some difference in the physical condition which depends on the location. Thus we have newly observed about 450 carbon stars in the Galaxy in the NIR to clarify the difference in the space distribution of carbon stars from that of O-rich AGB stars. Our observed results suggest that the space distribution of carbon stars is different from that of O-rich AGB stars and that the evolutionary process of AGB stars depend on the location in the Galaxy.

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] K.Noguchi: "Probable candidates for silicate carbon stars in the northern hemisphere" Publication of the Astronomical Society of Japan. 47. 41-46 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] J.Jugaku: "A search for Dyson spheres around late-type stars in the solar neighborhood" ASP Conference Series “Progress in the search for extraterrestrial lite". 74. 381-385 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Murakami: "The infrared telescope in space(IRTS)" Astrophysical Journal. 428. 354-362 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] M.Noda: "Near-infrared spectrometer on the infrared telescope in space" Astrophyicat Journal. 428. 363-369 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Noguchi et al.: "Probable candidates for silicate carbon stars in the northern hemisphere" Publ.Astron.Soc.Japan. vol.47. 41-46 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] J.Jugaku, K.Noguchi, S.Nishimura: "A search for Dyson spheres around late-type stars in the solar neighborhood" ASP conference series "Progress in the search for extraterrestrial life". vol.74. 381-385 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Murakami et al.: "The infrared telescope in space(IRTS)" Astrophysical Journal. vol.428. 354-362 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] M.Noda et al.: "Near-infrared spectrometer on the infrared telescope in space" Astrophysical Journal. vol.428. 363-369 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Noguchi: "Probable candidates for silicate carbonstars in the northem hemisphere" Rublication of the Astronomical Society of Japan. 47. 41-46 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] J.Jugaku: "Asearch for Dyson spheres around late-type stars in the solar neighborhood" ASP Conference Series "Progress in the search for extraterrestrial life". 74. 381-385 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] H.Murakami: "The in frared telescope in space (IRTS)" Astrophys,Journal. 428. 354-362 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] M.Noda: "Near-infrared spectrometer on the infraved telescope in space" Astrophys,Journal. 428. 363-369 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] K.Noguchi: "Probable candidates for silicate carbon stars with northern hemispheve" Publication of the Astronomical Society to Japan. 47. 41-46 (1995)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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