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Collapse, Equilibrium, and Fragmentation of Rotating, Adiabatic Clouds

Published online by Cambridge University Press:  12 April 2016

A. P. Boss
A. P. Boss*
Affiliation:
NASA-Ames Research Center Moffett Field, California 94035 U.S.A.

Abstract

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Numerical calculations of the collapse of adiabatic clouds from uniform density and rotation initial conditions show that when restricted to axisymmetry, the clouds form either near-equilibrium spheroids or rings. Rings form in the collapse of low thermal energy clouds and have β = T/|w|≳ 0.43. When the axisymmetric constraint is removed and an initial m=2 density variation is introduced, clouds either collapse to form near-equilibrium ellipsoids or else fragment into binary systems through a bar phase. Ellipsoids form in the collapse of high thermal energy clouds and have β ≲ 0.27. The results are consistent with the critical values of β for instabilities in Maclaurin spheroids, and suggest that protostellar clouds may undergo a dynamic fragmentation in the nonisothermal collapse regime.

Type
I. ID, 2D, and 3D Collapse of Interstellar Clouds
Information
International Astronomical Union Colloquium , Volume 58: Stellar Hydrodynamics , August 1980 , pp. 255 - 259
Copyright
Copyright © Reidel 1980

References

Bardeen, J.M.: 1971, Astrophys. J. 167, pp. 425–446.Google Scholar
Bodenheimer, P.: 1980, IAU Symposium #93: Fundamental Problems in Stellar Evolution.Google Scholar
Bodenheimer, P., and Ostriker, J.P.: 1973, Astrophys. J. 180, pp. 159–169.CrossRefGoogle Scholar
Boss, A.P.: 1980a, Astrophys. J. 236, pp. 619–627.Google Scholar
Boss, A.P.: 1980b, Astrophys. J. 237, pp. 866–876.Google Scholar
Boss, A.P.: 1980c, Astrophys. J., in press.Google Scholar
Boss, A.P.: 1980d, in preparation.Google Scholar
Cook, T.L., and Harlow, F.H.: 1978, Astrophys. J. 225, pp. 1005–1020.CrossRefGoogle Scholar
Marcus, P.S., Press, W.H., and Teukolsky, S.A.: 1977, Astrophys. J. 214, pp. 584–597.Google Scholar
Takahara, M., Nakazawa, K., Narita, S., and Hayashi, C.: 1977, Progr. Theor. Phys. 58, pp. 536–548.Google Scholar
Winkler, K.-H., and Newman, M.J.: 1980, Astrophys. J. 238, pp. 311–325.Google Scholar