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Title:
Circumstellar ring formation in rapidly rotating protostars
Authors:
Williams, Harold A.; Tohline, Joel E.
Affiliation:
AA(Louisiana State University, Baton Rouge), AB(Louisiana State University, Baton Rouge)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 334, Nov. 1, 1988, p. 449-464. (ApJ Homepage)
Publication Date:
11/1988
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Protostars, Star Formation, Stellar Envelopes, Stellar Rotation, Angular Momentum, Computerized Simulation, Hydrodynamics, Molecular Clouds, Potential Energy
DOI:
10.1086/166849
Bibliographic Code:
1988ApJ...334..449W

Abstract

A three-dimensional hydrodynamic computer program is used to study rapidly rotating, self-gravitating polytropes with polytropic indices n = 0.8 and n = 1.8. The initial ratio of the rotational to gravitational potential energy is βi = 0.310 in both models. Both models, initially axisymmetric, are dynamically unstable toward the development of a nonaxisymmetric, two-armed spiral structure. Here the models are shown as they evolve to extremely nonlinear amplitudes: the end result in both cases is a type of fission. The models shed a fraction of their mass and angular momentum, producing a ring which surrounds a more centrally condensed object with βd= 0.27. The central object is a triaxial figure that is rotating about its shortest axis. The low-mass, roughly axisymmetric ring probably is capable of condensing into planets.

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