Prog. Theor. Phys. Vol. 39 No. 6 (1968) pp. 1448-1467

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Rapid Contraction of a Protostar to the Stage of Quasi-Hydrostatic Equilibrium. I

— The Case of One Solar Mass without Radiation Flow —

Takenori Nakano, Noboru Ohyama^* and Chushiro Hayashi^**

Research Institute for Fundamental Physics, Kyoto University, Kyoto
^*Department of Physics, Hiroshima University, Hiroshima
^**Department of Physics, Kyoto University, Kyoto

(Received February 17, 1968)

Abstract:

The evolution of an opaque protostar of one solar mass is investigated up to the onset stage of quasi-hydrostatic equilibrium by solving numerically the hydrodynamic equations of motion. The protostar is assumed to retain spherical symmetry. The dissipation of the energy of mass motion by shock waves is taken into account, but the radiation flow in the protostar is neglected because of the rapidity of the dynamics. It is found that the stellar structure at the onset stage of quasi-hydrostatic equilibrium is insensitive to the initial distributions of density and temperature in the protostar. At this onset stage the star has an isothermal and dense core and a tenuous envelope with a radius of about 200R_⊙. By the shock wave an outermost envelope having a mass as small as 10^-4M_⊙ is ejected from the star.

URL : http://ptp.ipap.jp/link?PTP/39/1448/
DOI : 10.1143/PTP.39.1448

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Citing Article(s) :

Progress of Theoretical Physics Vol. 41 No. 3 (1969) pp. 856-857 :
Collapse and Flare-up of Protostars

Shinji Narita, Takenori Nakano and Chushiro Hayashi
Progress of Theoretical Physics Vol. 41 No. 4 (1969) pp. 1021-1040 :
Hydrodynamical Behaviour of Gas Spheres with Masses of 10⁴ M_⊙ to 10²⁰ M_⊙

Takuya Matsuda and Humitaka Satō
Progress of Theoretical Physics Vol. 43 No. 3 (1970) pp. 672-683 :
Rapid Contraction of Protostars to the Stage of Quasi-Hydrostatic Equilibrium. II

Takenori Nakano, Noboru Ohyama and Chushiro Hayashi
Progress of Theoretical Physics Vol. 43 No. 4 (1970) pp. 942-964 :
Rapid Contraction of Protostars to the Stage of Quasi-Hydrostatic Equilibrium. III

Shinji Narita, Takenori Nakano and Chushiro Hayashi
Progress of Theoretical Physics Vol. 44 No. 1 (1970) pp. 77-98 :
Origin of the Solar System

Takenori Nakano
Progress of Theoretical Physics Vol. 45 No. 6 (1971) pp. 1737-1746 :
Condensation of Solid Hydrogen in Contracting Interstellar Clouds

Takenori Nakano
Progress of Theoretical Physics Vol. 52 No. 1 (1974) pp. 147-160 :
Dynamical Contraction of Infinite Plane-Symmetric Gas Clouds

Takashi Kusaka
Progress of Theoretical Physics Vol. 69 No. 2 (1983) pp. 480-502 :
The Densities of Charged Particles in Very Dense Interstellar Clouds

Toyoharu Umebayashi
Progress of Theoretical Physics Supplement No.70 (1981) pp. 54-76 :
Fundamental Processes in Star Formation

Takenori Nakano