Evolution of the luminosity and mass of stripped envelope stars of 0.8M_⊙, 1.2M_⊙, and 1.6M_⊙. Helium core burning models are displayed in blue, while helium shell burning models are displayed in orange. The blue shaded area indicates the parameter space in which the models predict SESs to be helium core burning; in the area above, SESs are predicted to be helium shell burning. In the gray hatched region, the models do not predict helium burning SESs. Top (solid lines): MESA tracks. Bottom (dashed lines): binary_c tracks.