Results 201 to 210 of about 42,848 (232)

Preferrential Concentration of Particles in Protoplanetary Nebula Turbulence

, 2015
T. Hartlep, Jeffrey N. Cuzzi
openalex   +1 more source

Presolar Grains as Probes of Supernova Nucleosynthesis. [PDF]

Space Sci Rev
Liu N, Lugaro M, Leitner J, Meyer BS, Schönbächler M.   +4 more
europepmc   +1 more source

Understanding the Formation of Saturn's Regular Moons in the Context of Giant Planet Moons Formation Scenarios. [PDF]

Space Sci Rev
Blanc M, Crida A, Shibaike Y, Charnoz S, El Moutamid M, Estrada P, Mousis O, Salmon J, Schneeberger A, Vernazza P.   +9 more
europepmc   +1 more source

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The Dust Subdisk in the Protoplanetary Nebula

Icarus, 1995
Abstract We present a self-consistent computation of the structure of the dust subdisk in the protoplanetary nebula. The main physical processes governing the dynamics of the dust disk are reviewed. A (nonlinear) vertical diffusion equation for the transport of dust particles is derived.
B. Dubrulle, G. Morfill, M. Sterzik
openaire   +2 more sources

Compact reflection nebulae associated with protoplanetary nebulae

Chinese Astronomy and Astrophysics, 1991
Abstract Optical identifications and slit spectra and CCD direct images show that, of the protoplanetary nebulae (PPN) selected from the IRAS Catalogue of Point Sources, three are associated with compact reflection nebulae. In this paper we use a spherically symmetric dust shell model to calculate the brightness and colour evolution of the central ...
null Hu Jing-yao, null Tang Qing-quan
openaire   +1 more source

The Onset of Axial Symmetry in Protoplanetary Nebulae

Astrophysics and Space Science, 1995
We have obtained resolved IR images, at wavelengths from 1.2μm to 12.5μm, of a small sample of protoplanetary nebulae. The results suggest that all PPNe are axially, not spherically, symmetric, that spherical symmetry ends at the tip of the AGB, and that AGB evolution terminates with a burst of remarkably rapid, equatorially concentrated mass-loss.
C. J. Skinner, M. Meixner, M. J. Barlow, K. Justtanont, J. F. Arens, J. G. Jernigan   +5 more
openaire   +1 more source

Investigating the nature of the protoplanetary nebula OH,231.8+4.2

Astronomy & Astrophysics
The protoplanetary nebula also known as the Rotten Egg or Calabash nebula, is seen in the direction of the open cluster M,46. While an association between the nebula and the cluster has been suggested in the past, it was never confirmed. Here, we present
A. Brunthaler, Yoon Kyung Choi, K. Menten, Mark J. Reid   +3 more
semanticscholar   +1 more source

Dirty ice grains in the protoplanetary nebula

Planetary and Space Science, 1997
Abstract The model of Mekler and Podolak (1994) for the growth of small ice grains in the nebula is extended to allow for the presence of additional absorbers. The properties of these “dirty” grains are explored. The presence of an additional absorber allows for several interesting effects.
M. Podolak, Y. Mekler
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ISO Results for Protoplanetary Nebulae

2001
We discuss the results of analysis of Infrared Space Observatory spectra of PPN candidates. In particular for the carbon-rich PPNs in our sample we have analysis of the 21 and 30 μm features as well as the UIR features and plateaus. The 30 μm feature appears to have two sub-components, at about 27 and about 34 μm, which vary from source to source ...
Kevin Volk, Sun Kwok, Bruce Hrivnak, Ryszard Szczerba   +3 more
openaire   +1 more source

H2 Spectroscopy of Protoplanetary Nebulae

2001
Observations of planetary and protoplanetary nebulae in the spectral line of molecular hydrogen at 2.1218 μm are providing new insights into the processes of formation and evolution of post-AGB stars. In this paper, we present three significant results from the study of H2 toward planetary and protoplanetary nebulae.
David A. Weintraub, Joel H. Kastner, Ian Gatley   +2 more
openaire   +1 more source