Shinji Narita
Doshisha University
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Publication
Featured researches published by Shinji Narita.
The Astrophysical Journal | 1984
Shoken M. Miyama; Chushiro Hayashi; Shinji Narita
Isothermal collapse of a rotating interstellar cloud is computed three dimensionally with a so-called smoothed particle method. Initial clouds are rigidly rotating homogeneous spheres with small density fluctuations (..delta..rho/rho> or approx. =0.05). To find a condition for fragmentation of a cloud, we test a wide range of intial conditions in the ..cap alpha../sub 0/-..beta../sub 0/ plane, where ..cap alpha../sub 0/ and ..beta../sub 0/ are the initial ratios of thermal and rotational energies to gravitational energy, respectively.
The Astrophysical Journal | 1987
Masayoshi Kiguchi; Shinji Narita; Shoken M. Miyama; Chushiro Hayashi
The effect of rotation on the equilibrium structure of an axisymmetric isothermal gas cloud embedded in a stationary external medium is investigated by means of numerical simulations. The underlying assumptions, basic equations, input parameters, and numerical approach are explained, and the results are presented in extensive tables and graphs and characterized in detail. The critical central density and rotation energy, beyond which clouds become unstable to global contraction/expansion and ring formation, respectively, are found to be 800 times the boundary-surface density (BSD) and 0.44 times the gravitational energy. Stable rotating clouds are shown to have maximum mass 31 times that of nonrotating clouds, maximum mean rotation velocity 2.7 times the sound speed, and maximum mean density 6 times BSD. An expression for the maximum height of the boundary surface above the equatorial plane is derived. 41 references.
Proceedings of The International Astronomical Union | 1991
Masayoshi Kiguchi; Shinji Narita; T. Terasawa; Chushiro Hayashi
We are now carrying out the project to investigate how the primodial solar disk is formed and evolves. One of the central problems of this project is to study the angular momentum transfer in the nebula caused by the magnetic braking or the turbulent mixing in the boundary layer between the surface of the disk and its high temperature corona envelope.
Progress of Theoretical Physics | 1987
Shoken M. Miyama; Shinji Narita; Chushiro Hayashi
Progress of Theoretical Physics | 1987
Shoken M. Miyama; Shinji Narita; Chushiro Hayashi
Progress of Theoretical Physics | 1982
Chushiro Hayashi; Shinji Narita; Shoken M. Miyama
Progress of Theoretical Physics | 1984
Shinji Narita; Chushiro Hayashi; Shoken M. Miyama
Progress of Theoretical Physics | 1987
Shoken M. Miyama; Shinji Narita; Chushiro Hayashi
Publications of the Astronomical Society of Japan | 1998
Masayoshi Kiguchi; Shinji Narita; Chushiro Hayashi
Progress of Theoretical Physics | 1978
Shinji Narita; Kiyoshi Nakazawa