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Dynamical Evolution of Globular Clusters

Research Project

Project/Area Number 60540159
Research Category

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

Allocation TypeSingle-year Grants
Research Field Astronomy
Research InstitutionKyoto University

Principal Investigator

INAGAKI Shogo  Instructor, Dept. of Astron., Fac. of Sci., Kyoto University, 理学部, 助手 (80115790)

Co-Investigator(Kenkyū-buntansha) ISHIZAWA Toshiaki  Associate Professor, Dept. of Astron., Fac. of Sci., Kyoto University, 理学部, 助教授 (10025398)
KATO Shoji  Professor, Dept. of Astron., Fac. of Sci., Kyoto University, 理学部, 教授 (80011534)
Project Period (FY) 1985 – 1986
Project Status Completed (Fiscal Year 1986)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1986: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1985: ¥1,000,000 (Direct Cost: ¥1,000,000)
KeywordsStellar dynamics / Globular clusters / Post-collapse Evolution
Research Abstract

It is known that the cores of globular clusters evolve toward higher density states due to two-body gravitational interactions. When the densities of the cores become higher than a certain value, we have to take into account other interactions. We call the evolution of this stage post-collapse evolution. Investigations of post-collapse evolution of globular clusters become one of the most important problems in theoretical astrophysics.
In this project we treated stars as point masses and neglected the effects of finite size of stars.
In 1985 fiscal year we studied the evolution of cores of globular clusters with N-body numerical experiments. When the core densities of globular clusters become sufficiently high, hard binaries are formed inside the cores. The binaries interact with field stars and reversal of core contraction occurs. However, when the binding energies of the binaries become large enough, the binaries are ejected from the cores and the cores contract again. The densities of … More the cores become high again and hard binaries are formed. This leads to the reexpansion of the cores. Thus the oscillations of the core density were found to be due to the activity of hard binaries.
In 1986 fiscal year N-body codes were vectorized with the collaboration of Dr. S.J. Aarseth, Institute of Astronomy, University of Cambridge. As the result, the computations with N-body code were speeded up more than ten times.
Though N-body experiments are speeded up, a large amount of computational time is still necessary. Therefore it is impossible to follow the long-term evolution of globular clusters. We are attempting to follow the long-term evolution of cores of globular cluster by making simple models. We have known the probability of formation of binaries, the rate of interaction between binaries and field stars, and the rate of energy production. We are making models of cores of globular clusters with the use of these data. This investigation is under progress now and we have not got definite conclusions yet. Less

Report

(1 results)
  • 1986 Final Research Report Summary
  • Research Products

    (24 results)

All Other

All Publications (24 results)

  • [Publications] S.Inagaki: 'Dynamics of Star Clusters' Proc.IAU Symposium 113. 113. 189-206 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] S.Inagaki: Astrophys.Journal. 292. 339-347 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] E.Bettwieser: Monthly Notices Roy.Astron.Soc.213. 473-483 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] P.Hut: Astrophys.Journal. 298. 502-520 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] P.Wiyanto: Publ.Astron.Soc.Japan. 37. 715-720 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] S.Inagaki: Theoretical Aspect on Structure,Activity,and Evolution of Galaxies.【III】.ed.S.Aoki & Y.Yoshii. 57-64 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] S.Inagaki: Proc.Third Asian-Pacific Regional Meeting of the IAU,Astrophys.Space Sci.118. 367-370 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] S.Inagaki: Publ.Astron.Soc.Japan. 38. 853-863 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] S.J.Aarseth: Proc.Workshop of Use of Supercomputers in Stellar Dynamics. (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] S.Inagaki: Foundations of Physics. (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] S.Inagaki: Proc.IAU Symposium 126. (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] R.Elson: Ann.Rev.Astron.Astrophys.(1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] S. Inagaki: "Dynamical Evolution of Multi-Component Star Clusters." Proc. IAU Symposium 113, 'Dynamics of Star Clusters'.113. 189-206 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] S. Inagaki: "Equipartition in Multi-Component Gravitational Systems." Astrophys. Journal. 292. 339-347 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] E. Bettwieser: "A Gas Model for Multi-Component Star Clusters: 1) Method and Comparison with Fokker-Planck Theory." Mcnthly Notices Roy. Astron.Soc.213. 473-483 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] P. Hut: "Globular Cluster Evolution with Finite-Size Stars: Cross Sections and Reaction Rates." Astrophys. Journal. 298. 502-520 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] P. Wiyanto: "On the Evolution of Single-Component King's Cluster." Publ. Astron. Soc. Japan. 37. 715-720 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] S. Inagaki: "Evolution of Globular Clusters after Gravothermal Catastrophe." Theoretical Aspect on Structure, Activity, and Evolution of Galaxies. III. ed. S. Aoki and Y. Yoshii. 57-64 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] S. Inagaki: "Post-Collapse Evolution of Small-N Clusters" Proc. Third Asian-Pacific Regional Meeting of the IAU Astrophys. Space Sci.118. 367-370 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] S. Inagaki: "Post-Collapse Evolution of Globular Clusters with Finite Number of Stars in the Core." Publ. Astron. Soc. Japan. 38. 853-863 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] S.J. Aarseth: "Vectorization of N-Body Codes." Proc. Workshop of Use of Supercomputers in Stellar Dynamics. (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] S. Inagaki: "Review of 'Gravitational Physics of Stellar and Galactic Systems'. (by W.C. Saslaw, Cambridge University Press)" Foundations of Physics. (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] S. Inagaki: "Pre-Collapse Evolution of Globular Clusters." Proc. IAU Symposium 126. 126. (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] R. Elson: "Dynamical Evolution of Globular Clusters." Ann. Rev. Astron. Astrophys.(1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary

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Published: 1987-03-31   Modified: 2016-04-21  

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