Post-impact evolution of the photosphere luminosity, L, effective temperature, T_eff, radius, R, and surface gravity, g, of a surviving He-star companion as functions of time. The solid line and dash-dotted line respectively correspond to the results from 1D calculations using the KEPLER code and the MESA code. For comparison, the MESA results based on the impact simulations that do and do not include the binary orbital motion and stellar spin are given as thick solid lines and thin solid lines, respectively.