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The structure of Model J32 as the jet nears the surface 7820 seconds
after core collapse. The total explosion energy at this time is 4.1 x
10^{51} ergs at this time, close to the final value. The
theta velocity, radial velocity and logarithms of density and pressure
are given with the minimum and maximum values for v_{theta}
are -1.5 X 10^{9} and 1.5 X 10^{9}, for radial
velocity, v_{r} -6.7 X 10^{7} and 1.0 X
10^{10}, for density, log density, -9 and -6.8, and for
pressure, log P, 2.5 and 10.9, all in cgs units. The colors indicate
the interpolation scale between minimum and maximum. Positive
v_{theta} is motion away from the polar axis (theta = 0) along
an arc of constant radius. The v_{theta} plot shows the
expansion of the high pressure bubble blown by the jet sweeping around
the star (red region) but also an inner region of collimation (blue,
purple, and green). At r = 7 X 10^{13} cm the x-component of
the velocity of the expansion shock is v_{x} = 2.0 X
10^{9} cm/s (compared to a sound speed of only 3 X
10^{6} cm/s), while the y-component is v_{y} = 9.6 X
10^{9} cm/s resulting in an aspect ratio for the bubble
between 0.2 and 0.3. The velocity and pressure plots show a
collimation of the jet flow near 10^{13} cm, well into the
hydrogen envelope of the star, and evacuation of a low density column
by the jet. Not however, the plug of high density material being
shoved along by the jet.being shoved along by the jet.

Andrew MacFadyen- andrew@ucolick.org - October 25, 1999

Kerr Hall 237B - (831)459-2774

Lick Observatory and Department of Astronomy and Astrophysics

UC Santa Cruz, CA 95064, U.S.A.