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1987 Fiscal Year Final Research Report Summary

Research on Star Formation and Associated Gas DynamicalPhenomena

Research Project

Project/Area Number 60302015
Research Category

Grant-in-Aid for Co-operative Research (A)

Allocation TypeSingle-year Grants
Research Field Astronomy
Research InstitutionKyoto University

Principal Investigator

NAKANO Takenori  Faculty of Science, Kyoto University, 理学部, 助教授 (30027346)

Co-Investigator(Kenkyū-buntansha) MIYAMA Shoken M.  Faculty of Science, Kyoto University, 理学部, 助手 (00166191)
FUKUI Yasuo  Faculty of Science, Nagoya University, 理学部, 助教授 (30135298)
IKEUCHI Satoru  Tokyo Astronomical Observatory, University of Tokyo, 東京天文台, 助教授 (90025461)
KAIFU Norio  Tokyo Astronomical Observatory, University of Tokyo, 東京天文台, 助教授 (50011630)
UCHIDA Yutaka  Faculty of Science, University of Tokyo, 理学部, 教授 (90012814)
Project Period (FY) 1985 – 1987
Keywordsstar formation / Protostars / Infrared objects / Bipolar molecular flows / Molecular clouds / 回転ガス雲 / 磁気星間雲 / 銀河磁場
Research Abstract

1. Equilibrium structure of rotating interstellar clouds has been investigated and the maximum mass of the cloud in equilibrium has been determined. 2. The stability of rotating clouds has been investigated by following the dynamical evolution of the cloud starting from the equilibrium state and it has been found that the cloud is unstble when the ratio of the semi-major axes exceeds about 4. 3. The dissipation processes of magnetic fields in the interstellar clouds have been investigated and it has been found that the magnetic field is well frozen to the gas at the density n_H 10^<11>cm^<-3>, decouples from the gas at n_H 5x10^<11>cm^<-3>, and recovers the coupling when the temperature T exceeds about 1000K. Therefore, most of the initial magnetic flux of the cloud is lost between the states of n_H 5x10^<11>cm^<-3> and T 1000K. 4. It has been shown that the steady magnetic field is maintained in the spiral galaxy if the effect of turbulent diffusion of magnetic fields is taken into account. 5. By computer simulations of the phenomena around a contracting magnetized cloud with rotation, the bipolar flows similar to the observed ones in the star-forming regions have been found to occur. 6. The propagation of the stellar wind from a star surrounded by a gaseous disk has been investigated intending to derive a bipolar flow. 7. It has been found by the observations of some bipolar molecular flow sources that the flow has a rotational motion and has a shell structure and the central object is accompanied with a rotating disk. 8. Twenty-one bipolar flow objects have been newly found by the survey of some star-forming regions.

  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] T. Nakano and T. Umegayashi: Mon. Not. Roy. Astron. Soc.221. 319-338 (1986)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K. Shibata and Y. Uchida: Publ. Astron. Soc. Japan. 37. 31-46 (1985)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N. Kaifu et al.: Astrophys. J.314. 322-328 (1987)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Okuda and S. Ikeuchi: Publ. Astron. Soc. Japan. 38. 199-214 (1986)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S. M. Miyama et al.: Astrophys. J.317. 830-845 (1987)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y. Fukui et al.: Astrophys. J.311. L85-L88 (1986)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Nakano and T. Umebayashi: "Dissipation of magnetic fields in very dense interstellar clouds. II. Finalphases of star formation and the magnetic flux of a newborn star" Mon. Not. Roy. Astr. Soc.221. 319-338 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Shibata and Y. Uchida: "A magnetohydrodynamical mechanism for the formation of astrophysical jets. I.Dynamical effects of the relaxation of nonlinear magnetic twist." Publ. Astr. Soc. Japan. 37. 31-46 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N. Kaifu et al.: "High-resolution of observation of CO from the bright nebula CRL2688" Astrophys. J.314. 322-328 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Okuda and S. Ikeuchi: "Hydrodynamical models of the Orion-KL Nebula" Publ. Astron. Soc. Japan. 38. 199-214 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. Fukui et al.: "Discovery of seven bipolar outflows by an unbiased survey" Astrophys. J.311. L85-L88 (1986)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1989-03-30  

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