Observations of binaries in AGB, post-AGB stars and Planetary Nebulae

TL;DR

This paper reviews observational evidence for binary companions in AGB, post-AGB stars, and planetary nebulae, highlighting their role in nebula shaping and stellar evolution.

Contribution

It synthesizes recent observational studies to demonstrate the influence of binaries on nebula morphology and stellar evolution during late stellar phases.

Findings

Binaries are actively involved in shaping non-spherical planetary nebulae.

Evidence for binary companions exists during AGB, proto-Planetary Nebula, and Planetary Nebula phases.

Binaries impact the evolution and morphology of late-stage stellar objects.

Abstract

During the last years, many observational studies have revealed that binaries play an active role in the shaping of non spherical planetary nebulae. We review the different works that lead to the direct or indirect evidence for the presence of binary companions during the Asymptotic Giant Branch, proto-Planetary Nebula and Planetary Nebula phases. We also discuss how these binaries can influence the stellar evolution and possible future directions in the field.