7 Citations
The creation of AGB fallback shells
- Physics
- 2016
The possibility that mass ejected during Asymptotic Giant Branch (AGB) stellar evolution phases falls back towards the star has been suggested in applications ranging from the formation of accretion…
COMPARING SHOCKS IN PLANETARY NEBULAE WITH THE SOLAR WIND TERMINATION SHOCK
- Physics
- 2010
We show that suprathermal particles, termed pick-up ions (PUIs), might reduce the postshock temperature of the fast wind and jets in some planetary nebulae (PNs) and in symbiotic systems. The goal is…
Diffuse X-ray emissions from dynamic planetary nebulae
- Physics
- 2010
We present the theoretical results of a piecewise isothermal shock wind model. This was devised to predict the luminosity and surface brightness profile of diffuse X-ray emissions, primarily from the…
BINARITY AND THE ABUNDANCE DISCREPANCY PROBLEM IN PLANETARY NEBULAE
- Physics, Geology
- 2015
The discrepancy between abundances computed using optical recombination lines and collisionally excited lines is a major unresolved problem in nebular astrophysics. Here, we show that the largest…
THE CHANDRA PLANETARY NEBULA SURVEY (ChanPlaNS). III. X-RAY EMISSION FROM THE CENTRAL STARS OF PLANETARY NEBULAE
- Physics
- 2015
We present X-ray spectral analysis of 20 point-like X-ray sources detected in Chandra Planetary Nebula Survey observations of 59 planetary nebulae (PNe) in the solar neighborhood. Most of these 20…
Automatic alignment of multi-temporal images of planetary nebulae using local optimization
- PhysicsOptical Engineering + Applications
- 2010
Automatic alignment of time-separated astronomical images have historically proven to be difficult. The main reason for this difficulty is the amount of sporadic and unpredictable noise associated…
Curved Space: Theory of Everything
- Physics, Art
- 2021
Matter and energy are both made from curved space, the flow of space creates gravitation, and the increase of space causes the expansion of the universe. Matter curves in two different directions of…
References
SHOWING 1-10 OF 25 REFERENCES
On the origin of planetary nebulae.
- Physics, Geology
- 1978
The stellar wind from a red giant produces an extensive circumstellar cool nebula of appreciable mass. We suggest that in some cases mass loss continues until the hot core of the star is exposed, and…
On the evolution of those nuclei of planetary nebulae that experiencea final helium shell flash.
- Physics
- 1983
We suggest that some of the central stars of planetary nebulae experience a final thermal pulse having achieved a white dwarf configuration and begun their descent along a cooling white dwarf…
The Morphology of Planetary Nebulae: Simulations with Time-evolving Winds
- Physics
- 1998
We have carried out simulations of planetary nebulae (PNs) within the general framework of the interacting stellar winds models, wherein the fast wind from a central star sweeps up the slow wind…
On the frequency of planetary nebula nuclei powered by helium burning and on the frequency of white dwarfs with hydrogen-deficient atmospheres
- Physics
- 1984
The evolutionary behavior of a model central star of a planetary nebula is examined as a function of the phase in its nuclear burning cycle when its progenitor leaves the asymptotic giant branch for…
The evolution of planetary nebulae I. A radiation-hydrodynamics parameter study
- Physics
- 2004
We follow hydrodynamically the evolution of spherical model planetary nebulae subject to different initial conditions and with various central stars, investigating how combinations of central-star…
Late stages of stellar evolution. II: Mass loss and the transition of asymptotic giant branch stars into hot remnants
- Physics
- 1983
We have computed the transition of asymptotic branch giants of 0.8 and 1.0 M/sub sun/ into remnants of 0.565, 0.553, and 0.546 M/sub sun/ by means of mass loss which removed the stellar envelopes in…
Thermally Stable Nuclear Burning on Accreting White Dwarfs
- Physics
- 2007
One of the challenges to increasing the mass of a white dwarf through accretion is the tendency for the accumulating hydrogen to ignite unstably and potentially trigger mass loss. It has been known…
Backflow in post‐asymptotic giant branch stars
- Physics
- 2001
We derive the conditions for a backflow toward the central star(s) of circumstellar material to occur during the post-asymptotic giant branch (post-AGB) phase. The backflowing material may be…
The Elemental Abundances in Bare Planetary Nebula Central Stars and the Shell Burning in AGB Stars
- Physics
- 2005
We review the observed properties of extremely hot, hydrogen‐deficient post–asymptotic giant branch (AGB) stars of spectral type [WC] and PG1159. Their H deficiency is probably caused by a (very)…