  The Orion star-forming region is the nearest active high-mass star-forming
region and has created a large superbubble, the Orion-Eridanus superbubble.
Recent work by Ochsendorf et al. has extended the accepted boundary of the
superbubble. We fit Kompaneets models of superbubbles expanding in exponential
atmospheres to the new, larger shape of the Orion-Eridanus superbubble. We find
that this larger morphology of the superbubble is consistent with the evolution
of the superbubble being primarily controlled by expansion into the exponential
Galactic disk ISM if the superbubble is oriented with the Eridanus side farther
from the Sun than the Orion side. Unlike previous Kompaneets model fits that
required abnormally small scale heights for the Galactic disk (<40 pc), we find
morphologically consistent models with scale heights of 80 pc, similar to that
expected for the Galactic disk.
