238 citations · 3k across the 65 of their papers we have counts for
12 papers · 1 filter
Magnetic Mixing in Red Giant and Asymptotic Giant Branch Stars
J. Nordhaus, M. Busso, G. J. Wasserburg +2
The available information on isotopic abundances in the atmospheres of low-mass Red Giant Branch (RGB) and Asymptotic Giant Branch (AGB) stars requires that episodes of extensive m…
Towards a Spectral Technique for Determining Material Geometry Around Evolved Stars: Application to HD 179821
J. Nordhaus, I. Minchev, B. Sargent +6
HD 179821 is an evolved star of unknown progenitor mass range (either post-Asymptotic Giant Branch or post-Red Supergiant) exhibiting a double peaked spectral energy distribution (…
Dynamos and Chemical Mixing in Evolved Stars
J. Nordhaus, E. G. Blackman
In low-mass Red Giant Branch (RGB) and Asymptotic Giant Branch (AGB) stars, anomalous mixing must transport material near the hydrogen-burning shell to the convective envelope. Rec…
Planetary Nebulae Principles & Paradigms: Binaries, Accretion, Magnetic Fields
Eric G. Blackman, Jason T. Nordhaus
Observations suggest that many, if not all, post AGB systems evolve through an aspherical outflow phase. Such outflows require a sufficient engine rotational energy which binaries…
The Formation of Crystalline Dust in AGB Winds from Binary Induced Spiral Shocks
R. G. Edgar, J. Nordhaus, E. Blackman +1
As stars evolve along the Asymptotic Giant Branch, strong winds are driven from the outer envelope. These winds form a shell, which may ultimately become a planetary nebula. Many p…
The Bipolar Engines of post-AGB stars: Transient Dynamos and Common Envelopes
J. Nordhaus, E. G. Blackman
The physical mechanism(s) responsible for transitioning from a spherical Asymptotic Giant Branch (AGB) star to an asymmetric post-AGB (pAGB) object is poorly understood. In particu…
Crystalline silicates and dust processing in the protoplanetary disks of the Taurus young cluster
Dan M. Watson, Jarron M. Leisenring, Elise Furlan +15
We characterize the crystalline silicate content and spatial distribution of small dust grains in a large sample of protoplanetary disks in the Taurus-Auriga young cluster, using S…
New Constraints on the Galactic Bar
I. Minchev, J. Nordhaus, A. C. Quillen
Previous work has related the Galactic Bar to structure in the local stellar velocity distribution. Here we show that the Bar also influences the spatial gradients of the velocity…
Isolated vs. Common Envelope Dynamos in Planetary Nebula Progenitors
J. Nordhaus, E. G. Blackman, A. Frank
The origin, evolution and role of magnetic fields in the production and shaping of proto-planetary and planetary nebulae (PPNe, PNe) is a subject of active research. Most PNe and P…
Low-Mass Binary Induced Outflows from Asymptotic Giant Branch Stars
J. Nordhaus, E. G. Blackman
A significant fraction of planetary nebulae (PNe) and proto-planetary nebulae (PPNe) exhibit aspherical, axisymmetric structures, many of which are highly collimated. The origin of…
Extracting Rotational Energy in Supernova Progenitors: Transient Poynting Flux Growth vs. Turbulent Dissipation
Eric G. Blackman, Jason T. Nordhaus, John H. Thomas
Observational evidence for anisotropy in supernovae (SN) may signal the importance of angular momentum and differential rotation in the progenitors. Free energy in differential rot…
Magnetorotational Instability in Liquid Metal Couette Flow
K. Noguchi, V. I. Pariev, S. A. Colgate +2
Despite the importance of the magnetorotational instability (MRI) as a fundamental mechanism for angular momentum transport in magnetized accretion disks, it has yet to be demonstr…