▪ Abstract We review the state of observational and theoretical studies of the sha** of
planetary nebulae (PNe) and protoplanetary nebulae (pPNe). In the past decade, high …

I review the influence jets and the bubbles they inflate might have on their ambient gas as
they operate through a negative jet feedback mechanism (JFM). I discuss astrophysical …

Common envelope evolution (CEE) is presently a poorly understood, yet critical, process in
binary stellar evolution. Characterizing the full 3D dynamics of CEE is difficult in part …

ABSTRACT Using Hubble Space Telescope images of 119 young planetary nebulae (PNs),
most of which have not previously been published, we have devised a comprehensive …

A significant fraction of planetary nebulae (PNe) and protoplanetary nebulae (PPNe) exhibit
aspherical, axisymmetric structures, many of which are highly collimated. The origin of these …

We have performed smoothed particle radiation magnetohydrodynamic simulations of the
collapse of rotating, magnetized molecular cloud cores to form protostars. The calculations …

Abstract Using the Hubble Space Telescope (HST), we have carried out a survey of
candidate preplanetary nebulae (PPNs). We report here our discoveries of objects having …

We present the first results of astrophysically relevant experiments where highly supersonic
plasma jets are generated via conically convergent flows. The convergent flows are created …

We investigate mass transfer and the formation of discs in binary systems using a
combination of numerical simulations and theory. We consider six models distinguished by …

Planetary nebulae are thought to be formed when a slow wind from the progenitor giant star
is overtaken by a subsequent fast wind generated as the star enters its white dwarf stage. A …