9 papers
MHD Disk Winds in PNe and pPNe
Adam Frank
Winds from accretion disks have been proposed as the driving source for precessing jets and extreme bipolar morphologies in Planetary Nebulae (PNe) and proto-PNe (pPNe). Here we ap…
Modulation of the X-ray Fluxes by the AEI
P. Varnière, M. Muno, M. Tagger +1
The Accretion-Ejection Instability (AEI) has been proposed to explain the low frequency Quasi-Periodic Oscillation (QPO) observed in low-mass X-Ray Binaries. Its frequency, typical…
The Last Hurrah: PPN Formation by a Magnetic Explosion
Sean Matt, Adam Frank, Eric Blackman
We discuss a mechanism by which a giant star can expel its envelope in an outburst, leaving its core exposed. The outburst is powered by rotational kinetic energy of the core, tran…
A Paradigm Lost: New Theories for Aspherical PNe
Adam Frank
Theoretical Models for the shaping of PNe are reviewed in light of new high resolution images. The new data indicate the purely hydrodynamic interacting stellar winds model can not…
Ambipolar Diffusion in YSO Jets
Adam Frank, Thomas A. Gardiner, Guy Delemarter +2
We address the issue of ambipolar diffusion in Herbig-Haro jets. The current consensus holds that these jets are launched and collimated via MHD forces. Observations have, however,…
Where's the Disk?: LBV bubbles and Aspherical Fast Winds
Adam Frank
Previous studies have explained the shapes of LBV nebulae, such as eta Car, by invoking the interaction of an isotropic fast wind with a previously deposited, slow aspherical wind…