Results 191 to 200 of about 293,009 (201)
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Properties of circumstellar grains in R coronae borealis
Astrophysics and Space Science, 1989Extinction curves for core-mantle and multicored grains containing two allotropic carbons are compared with far-UV extinction observations of the variable star R CrB. A good agreement is reached by multicore grains; but it is found that only during deep minimum considered models of grain do not fit the observational UV extinction.
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Silicon Oxide Nanoparticles Reveal the Origin of Silicate Grains in Circumstellar Environments
Nano Letters, 2006A synergistic effort combining experiments in beams and first principles theoretical investigations is used to propose mechanisms that could lead to the formation of silicates and nanoparticles with silicon-rich cores through agglomeration of SiO, an abundant oxygen-bearing species in space.
Arthur C, Reber +5 more
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Carbon Grains in the Circumstellar Envelope of IRC +10 216
1987We have made models of the spectral and spatial distribution of radiation from circumstellar grains in IRC +10 216, incorporating new opacity laws for graphite and amorphous carbon; graphite still seems less suitable than amorphous carbon. The predicted size of the scattered-light halo is consistent with visibility observations and direct imaging ...
P. G. Martin, C. Rogers
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Dust Grains and Circumstellar Motion: The Problem of the Henand the Egg
Astrophysics and Space Science, 2000In the last ten years, the number of models of circumstellar envelopes has exponentially increased, both concerning evolved stars and forming stars with their planetary systems. The main progress was intoduction of chemistry and coupling with dynamics.
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Experimental Studies of Circumstellar, Interstellar and Interplanetary Refractory Grains Analogs
1988The history of refractory matter in the universe can be extremely complex. After synthesis in stellar interiors and migration to the stellar surface, refractory atoms and molecules can be expelled in a variety of ways as part of a circumstellar outflow.
J. A. Nuth +3 more
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Amorphous carbon grains and the circumstellar extinction around c‐rich objects
AIP Conference Proceedings, 1994Vincenzo Orofino, S Fonti
exaly
DETECTION OF WATER ICE GRAINS ON THE SURFACE OF THE CIRCUMSTELLAR DISK AROUND HD 142527*
Astrophysical Journal, 2009Motohide Tamura, Akio Inoue
exaly