Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...315..259f&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 315, April 1, 1987, p. 259-263.
Astronomy and Astrophysics
Astrophysics
6
Angular Momentum, Interstellar Matter, Star Formation, Turbulent Flow, Autocorrelation, Molecular Clouds, Protostars, Stellar Rotation
Scientific paper
The role of turbulence in the establishment of interstellar cloud and protostellar angular momentum has been investigated. The specific angular momentum of an interstellar condensation has been calculated for two reasonably approximate forms of the velocity autocorrelation function: a step function and an exponential. It is found that the angular momentum of interstellar material depends primarily on the ratio of the region size to the correlation length of the turbulent motions: When this ratio is large (small), the degree of correlation is low (high) and the angular momentum is low (high). For the case of uncorrelated motions, the results obtained from previous models which assume uncorrelated, random, turbulent motions are recovered. A variety of the observed angular momentum properties of interstellar clouds and stellar systems can be understood on the basis of the results of these calculations.
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