Chapter 4 The Equilibrium and the Stability of Rotating Isothermal Clouds : Part II Formation Processes of Protostars : Origin of the Solar System

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概要

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• We review the equilibrium structure of rotating isothermal clouds. First, we describe the equilibrium structure obtained under the assumption that the clouds are axisymmetric and embedded in a stationary external medium. Next, we describe the stability of these clouds examined by following the evolution from the equilibrium state. We find from this study that (1) the clouds with the density contrast from center to edge greater than 800 are unstable to global contraction or expansion, (2) the clouds with rotation energy greater than 0.44 times gravitational energy are unstable to ring formation, and (3) the clouds with rotation energy greater than 0.27 times gravitational energy are unstable to nonaxial deformation. The deformation grows to form spiral arms. We find further that (1) the maximum mass of clouds is 4 times that of nonrotating clouds, (2) the maximum mean rotation velocity is 2c_s, where c_s is the sound velocity, (3) the maximum mean density is 6 times the edge density, and (4) for each cloud, the maximum height of the boundary surface from the equatorial plane is nearly given by 0.3c_<s^2>/√(GP_e), where P_e is the external pressure.

• 理論物理学刊行会の論文
• 1989-03-10

著者

• Miyama S

  National Astronomical Observatory

• Miyama Shoken

  Department Of Physics Kyoto Unvi

• Miyama Shoken

  Department Of Physics Kyoto Univeristy

• Hayashi Chushiro

  Kyoto University

• KIGUCHI Masayoshi

  Research Institute for Science and Technology, Kinki University

• NARITA Shinji

  Science and Engineering Research Institute, Doshisha University

• Narita Shinji

  Department of Electronic Engineering, Doshisha University

• Shoken M.

  National Astronomical Observatory

• Narita Shinji

  Science And Engineering Research Institute Doshisha University

• Hayashi C

  Kyoto University

• Narita S

  Science And Engineering Research Institute Doshisha University

• Kiguchi M

  Kinki Univ. Higashi‐osaka Jpn

• Kiguchi Masayoshi

  Research Institute For Fundamental Physics Kyoto University

• NARITA Shinji

  Department of Electronics, Doshisha University

• NARITA Shinji

  Department of Electonics, Doshisha University

• KIGUCHI Masayoshi

  Research Institute for Science and Technology Kinki University

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