Abstract
view Abstract Citations (65) References (32) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Circumstellar Ring Formation in Rapidly Rotating Protostars Williams, Harold A. ; Tohline, Joel E. 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. Publication: The Astrophysical Journal Pub Date: November 1988 DOI: 10.1086/166849 Bibcode: 1988ApJ...334..449W Keywords: Protostars; Star Formation; Stellar Envelopes; Stellar Rotation; Angular Momentum; Computerized Simulation; Hydrodynamics; Molecular Clouds; Potential Energy; Astrophysics; HYDRODYNAMICS; PLANETS: GENERAL; STARS: CIRCUMSTELLAR SHELLS; STARS: ROTATION full text sources ADS |
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