Results 171 to 180 of about 14,221 (195)

Terahertz Science and Technology in Astronomy, Telecommunications, and Biophysics. [PDF]

Research (Wash D C)
Li J, Deng X, Li Y, Hu J, Miao W, Lin C, Jiang J, Shi S.   +7 more
europepmc   +1 more source

Primitive asteroids as a major source of terrestrial volatiles. [PDF]

Sci Adv
Martins R, Morton EM, Kuthning S, Goes S, Williams HM, Rehkämper M.   +5 more
europepmc   +1 more source

Diversity of protonated mixed pyrene-water clusters investigated by collision induced dissociation.

Phys Chem Chem Phys
M Nair A, Leboucher H, Toucouere L, Zamith S, Joblin C, L'Hermite JM, Marciniak A, Simon A.   +7 more
europepmc   +1 more source

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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.
M. J. Barlow, John F. Arens, Kay Justtanont, C. J. Skinner, Margaret Meixner, J. G. Jernigan   +5 more
openaire   +2 more sources

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.
Gregor E. Morfill, Michael Sterzik, Bérengère Dubrulle   +2 more
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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 ...
Hu Jing-yao, Tang Qing-quan
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Formation of amorphous ice in the protoplanetary nebula

Planetary and Space Science, 1994
Abstract The criteria for formation of amorphous ice in different models of the protoplanetary nebula are developed. Assuming that comets are composed mostly of amorphous ice, it is shown that the inner boundary of formation of cometary nuclei is about 7 A.U.
Y. Mekler, Morris Podolak
openaire   +2 more sources

Thermal cycling and fluctuations in the protoplanetary nebula

Icarus, 1988
Abstract The cooling of the protoplanetary nebula is controlled largely by the opacity of dust grains. Usually nebula structure models employ standard opacity tables calculated for ensembles of micron-sized dust grains, which are assumed to dominate the opacity.
Christoph K. Goertz, Ove Havnes, Gregor E. Morfill   +2 more
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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.
Ian Gatley, Joel H. Kastner, David A. Weintraub   +2 more
openaire   +2 more sources