 Asymptotic giant branch

An asymptotic-giant-branch star has an inert carbon-oxygen core surrounded by helium- and hydrogen-burning shells and a deep convective envelope. Alternating shell burning produces thermal pulses and dredge-up, while strong mass loss removes the envelope.

The Asymptotic Giant Branch (AGB) is a phase in the evolution of stars, particularly those with initial masses between approximately 0.6 and 8 times that of the Sun. This stage occurs after a star has completed the hydrogen and helium burning phases in its core and is characterized by significant changes in the star's structure and composition.