Bound fraction of recently ejected circumstellar material

Determine what fraction of the recently ejected circumstellar material surrounding water fountains and obscured post-asymptotic-giant-branch stars remains bound to the binary system and can contribute to circumbinary-disc formation.

Background

The paper proposes that water fountains and obscured post-asymptotic-giant-branch stars may represent post-mass-transfer progenitors of the observed shell-burning stripped giant binaries. These objects possess substantial amounts of recently ejected circumstellar material, but the material may be partly unbound and expanding rather than organized into a long-lived circumbinary disc. Establishing the bound fraction is therefore important for assessing whether these systems can produce the initially massive discs required for significant eccentricity pumping.