Image Details
 
                    Caption: Figure 25.
Radial velocity and ﹩{Y}_{{\rm{e}}}﹩ profiles at the onset of core collapse for the Mi = 15 ﹩{{\rm{M}}}_{\odot }﹩ model. Dashed curves show the results using a 22 isotope network and solid curves show the results using a 204 isotope network. Both models are evolved from the pre main-sequence to the onset of core collapse with their respective reaction network. The vertical gray lines mark the mass of the iron core as defined by the ﹩{Y}_{{\rm{e}}}﹩ jump.
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