Photodissociation in proto-planetary nebulae - Hydrodynamical simulations and solutions for low-velocity multi-lobes

  title={Photodissociation in proto-planetary nebulae - Hydrodynamical simulations and solutions for low-velocity multi-lobes},
  author={Guillermo Garc{\'i}a-Segura},
  journal={Astronomy and Astrophysics},
Aims. We explore the effects of photodissociation at the stages of post-asymptotic giant branch stars to find a mechanism able to produce multi-polar shapes. Methods. We perform two-dimensional gasdynamical simulations to model the effects of photodissociation in proto-planetary nebulae. Results. We find that post-asymptotic giant branch stars with ∼7000 K or hotter are able to photodissociate a large amount of the circumstellar gas. We compute several solutions for nebulae with low-velocity… Expand

Figures and Tables from this paper

A wind–shell interaction model for multipolar planetary nebulae
We explore the formation of multipolar structures in planetary and pre-planetary nebulae from the interaction of a fast post-AGB wind with a highly inhomogeneous and filamentary shell structureExpand
Multipolar young planetary nebulae modelled as a precessing and orbiting jet with time-dependent ejection velocity
We have carried out 3D hydrodynamic simulations of precessing, variable ejection velocity bipolar jets in order to model multipolar protoplanetary (or planetary) nebulae. For these nebulae, we assumeExpand
A young multipolar planetary nebula in the making—IRAS 21282+5050
We present high-angular-resolution Hubble Space Telescope (HST) optical and near-infrared imaging of the compact planetary nebula (PN) IRAS 21282+5050. Optical images of this object reveal severalExpand
We report high angular resolution Hubble Space Telescope observations of 10 compact planetary nebulae (PNs). Many interesting internal structures, including multipolar lobes, arcs, two-dimensionalExpand
Dynamical modeling and the interactions with the ISM
  • W. Steffen
  • Physics
  • Proceedings of the International Astronomical Union
  • 2011
Abstract This paper is a review of some of the recent modeling efforts to improve our understanding of structure formation and evolution of planetary nebulae including their interaction with theExpand
The Owl and other strigiform nebulae: multipolar cavities within a filled shell★
We present the results of long-slit echelle spectroscopy and deep narrow-band imaging of the Owl Nebula (NGC 3587), obtained at the \textit{Observatorio Astron\'omico Nacional, San Pedro M\'artir}.Expand
Planetary Nebulae Detected in the Spitzer Space Telescope GLIMPSE 3D Legacy Survey
We used the data from the Spitzer Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE) to investigate the mid-infrared (MIR) properties of planetary nebulae (PNs) and PN candidates. In previousExpand
‘Distance mapping’ and the 3D structure of BD +30° 3639
BD +30° 3639 is a member of a group of uncommon planetary nebulae with Wolf–Rayet central star and higher expansion velocities in [O iii] than in [N ii] lines. Images and high-resolution spectra fromExpand
Planetary Nebulae Detected in the Spitzer Space Telescope GLIMPSE II Legacy Survey
We detected and imaged 30 planetary nebulae in the Sptizer Space Telescope Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE) survey. The distribution of warm dust is clearly shown inExpand


Merged Ionization/Dissociation Fronts in Planetary Nebulae
The hydrogen ionization and dissociation front around an ultraviolet radiation source should merge when the ratio of ionizing photon flux to gas density is sufficiently low and the spectrum isExpand
Shaping Bipolar and Elliptical Planetary Nebulae: Effects of Stellar Rotation, Photoionization Heating, and Magnetic Fields
We present two-dimensional hydrodynamical and magnetohydrodynamical simulations of the evolution of planetary nebulae formed through the interaction of two succeeding, time-independent stellar winds.Expand
The Dynamical Evolution of the Circumstellar Gas around Low- and Intermediate-Mass Stars. II. The Planetary Nebula Formation
We have studied the effect of the mass of the central star (CS) on the gas evolution during the planetary nebula (PN) phase. We have performed numerical simulations of PN formation using CS tracksExpand
Synthetic Post-Asymptotic Giant Branch Evolution: Basic Models and Applications to Disk Populations
We explore the realm of post-asymptotic giant branch (post-AGB) stars from a theoretical viewpoint, by constructing a synthetic population of transition objects, proto-planetary nebulae, planetaryExpand
Three-Dimensional Dynamical Instabilities in Galactic Ionization Fronts
Ionization front instabilities have long been of interest for their suspected role in a variety of phenomena in the galaxy, from the formation of bright rims and 'elephant trunks' in nebulae toExpand
Revealing the Photodissociation Region: HST/NICMOS Imaging of NGC 7027
We report results from a Hubble Space Telescope (HST) and Near-Infrared Camera and Multiobject Spectrometer (NICMOS) program to study the distribution of hot neutral (molecular hydrogen) and ionizedExpand
Photoionized and Photodissociated Regions around Main-Sequence Stars
Within a molecular cloud, the strong ultraviolet radiation field produced by newly formed stars dissociates and ionizes the surrounding molecular gas. The radiative flux depends on the effectiveExpand
Magnetically driven winds from post-asymptotic giant branch stars: Solutions for high-speed winds and extreme collimation
This paper explores the effects of post-asymptotic giant branch (AGB) winds driven solely by magnetic pressure from the stellar surface. It is found that winds can reach high speeds under thisExpand
The evolution of planetary nebulae. III - Position-velocity images of butterfly-type nebulae
Observations of the motions of the shells of the planetary nebulae NGC 2346, NGC 2371-2, NGC 2440, NGC 6058, NGC 6210, IC 1747, IC 5217, J-320, and M2-9 are presented. These are all 'butterfly' typeExpand
Three-Dimensional Magnetohydrodynamical Modeling of Planetary Nebulae: The Formation of Jets, Ansae, and Point-symmetric Nebulae via Magnetic Collimation
Three-dimensional, magnetohydrodynamical simulations of the formation and evolution of planetary nebulae are discussed, and we confirm that planetary nebula jets and ansae can be obtained by magneticExpand