Collapse of the presolar nebula

Details Collapse of the presolar nebula Collapse of the presolar nebula

Oct 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978m%26p....19..229t&link_type=abstract

(Conference on Protostars and Planets, Tucson, Ariz., Jan. 3-7, 1978.) Moon and the Planets, vol. 19, Oct. 1978, p. 229-236.

Computer Science

20

Gravitational Collapse, Nebulae, Protostars, Solar System, Stellar Evolution, Interplanetary Dust, Stellar Models, Temperature Distribution, Thermodynamic Equilibrium

Scientific paper

The hydrodynamical axially symmetric collapse of a 3-solar-mass cloud with an initial density of 10 to the -20th power g/cu cm has been investigated. In order to arrive at an equilibrium configuration, a temperature of 15 K has been assumed. During about nine free-fall times the cloud has been artificially cooled down to the (Jeans-) critical temperature of 8 K. Thus, the dynamical collapse studied in this paper starts from an equilibrium configuration following a slow quasi-hydrostatic contraction. Two sequences corresponding to a different choice of the initial angular velocity, 10 to the -14th power per sec (Case A) and 10 to the -15th power per sec (Case B), have been computed. In both cases a fast spinning, optically thick disklike core of low mass and temperature forms for which fission into two or even more pieces is very likely to occur.

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