Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979m%26p....21...63h&link_type=abstract
Moon and the Planets, vol. 21, Aug. 1979, p. 63-121.
Astronomy and Astrophysics
Astronomy
11
Astronomical Models, Cosmology, Protoplanets, Solar System, Celestial Mechanics, Collision Parameters, Drag Measurement, Gas Density, Gas Temperature, Gravitational Effects, Kepler Laws, Opacity, Planetary Rotation
Scientific paper
An approximate analytical model for the density and temperature distribution in the protoplanetary clouds is presented. The rotation of the planets is discussed and it is determined that it cannot be calculated solely on the energy conservation laws. The velocity of gases in the protoplanetary cloud is found to be smaller, by 5 times 10 to the third cm/s, in comparison to the Keplerian circular velocity. The radii of some planetesimals and their accretion through vertical and horizontal motion and their characteristics are described. The rate of change of relative velocities due to close gravitational encounters and the equations governing the late stage of accretion are derived. Numerical results of gas drag effects, collisions, and final accretion states are also presented.
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