PX282 - C9c - bound-free absorption

• the stellar spectrum is a continuum, with cut-offs due to bound-free absorptions
• any $E>{\chi }_i$ can be absorbed
• electrons get the excess energy as kinetic energy
• each energy state gets a cut-off

image: D. Armstrong, lecture slides

• the continuum line depends on ${\nu }_{\gamma }^{-3}$, which arises form electrodynamics