Invited Presentation

Spiral-shell patterns surrounding evolved stars, proving binary properties

Author(s): Hyosun Kim (KASI)

Presenter: Hyosun Kim (KASI)

A growing consensus has been developing in the past few decades that binarity is key in providing an understanding of the morphological diversities of the circumstellar envelopes (CSEs) surrounding stars in the Asymptotic Giant Branch (AGB) to Planetary Nebula (PN) phase. However, the number of detected binaries in particular with their orbital properties derived are still small. As a consequence, the possible roles of binaries in the shaping of PN and in the CSEs of AGB stars have yet to be clarified. To provide an interpretative framework for the increasing number of discoveries of recurrent patterns inscribed in the CSEs of AGB stars and PNe, we present template 3D hydrodynamic models with different viewing angles, primarily focusing on the effects of orbital eccentricity and companion mass.