Chapter 5 Collapse and Fragmentation of 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 and summarize the features of collapse and fragmentation of isothermal interstellar clouds. When a cloud collapses by its self-gravity, fragmentation occurs at a stage which is early or late, depending on the cloud mass. Fragmentation occurs at an early stage of collapse if a cloud is massive compared with the initial Jeans mass. On the other hand, a small cloud does not fragment at least until the central core becomes opaque and ceases to be collapsing. A sheet-like or a filamentary cloud is likely to fragment. The typical size of a fragment is several times the thickness of a sheet or the radius of a filament. Most fragments of a sheet are elongated, and massive enough to collapse if the external pressure is negligible. Accordingly they collapse and become filamentary. After a filament becomes opaque and stops collapsing, it fragments to form blobs with small masses of the order of 10^<-1>M_&xodoe;-10^<-3>M_&xodoe;. If there is some rotation, a collapsing cloud forms not filaments but spiral arms. It is possible that the central part of these spiral arms eventually fragments to blobs with the masses of the order of 10^<-1>M_&xodoe;-10^<-3>M_&xodoe;.

• 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 Electonics, Doshisha University

• KIGUCHI Masayoshi

  Research Institute for Science and Technology Kinki University

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