Results 231 to 240 of about 386,435 (271)

Dust production in circumstellar space

Astronomische Nachrichten, 1971
AbstractObservational indications which point out that the formation of dust particles in the circumstellar space usually accompanies the formation of most stars are discussed. An analytic treatment of circumstellar crushing processes leading to dust grains is presented.
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TEM studies of circumstellar dust

Proceedings, annual meeting, Electron Microscopy Society of America, 1992
In recent years the development of special chemical separation techniques has permitted the isolation of material from primitive meteorites that can be unambiguously identified as pre-solar grains-that is, solids that condensed in the atmospheres of ancient stars and later became incorporated into the cloud of gas and dust which gave rise to our solar ...
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First Optical Images of Circumstellar Dust Surrounding the Debris Disk Candidate HD 32297

, 2005
Near-infrared imaging with the Hubble Space Telescope recently revealed a circumstellar dust disk around the A star HD 32297. Dust-scattered light is detected as far as 400 AU radius, and the linear morphology is consistent with a disk ~10° away from an ...
P. Kalas
semanticscholar   +1 more source

Circumstellar dust, IR spectroscopy, and mineralogy

Proceedings of the International Astronomical Union, 2018
AbstractWe review the mineralogy of circumstellar dust grains around AGB stars as investigated through infrared spectroscopic studies. The expanding envelopes of AGB stars are chemically fresh because of the strong binding force of CO molecules. O-rich dust grains (silicates and oxides) form in O-rich envelopes and C-rich dust grains (amorphous carbon ...
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Circumstellar dust model for infrared stars

Astrophysics and Space Science, 1970
The expected thermal emission from the shell around stars has been calculated on the graphite model. The calculated spectral distribution is in reasonable agreement with the observed infrared emission from some of the infrared stars.
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Polarization analysis of circumstellar dust disks

AIP Conference Proceedings, 2012
Imaging polarimetry is a powerful technique to study circumstellar dusty environments. Detailed analyses of polarization disks allow to quantitatively evaluate the disk geometries and the dust properties. We present near-infrared (NIR) polarimetric images and radiative transfer modeling of the high-mass protostar CRL 2136 and the Herbig Be star R Mon ...
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Radiative Transfer in Circumstellar Dust Clouds

Symposium - International Astronomical Union, 1973
Radiative transfer methods are used to show how and to what extent the usual techniques relating color excess to optical depth through circumstellar material are not applicable.
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Properties of circumstellar dust in symbiotic Miras

2006
Symbiotic binaries with a cool Mira component are characterized by the presence of substantial dust and by the appearance of near-IR obscuration intervals. To understand such symbiotic Miras, their evolution, mutual interactions between the components and circumstellar matter, the influence of stellar winds and mass transfer mechanism, it is essential ...
Kotnik-Karuza, Dubravka, Jurkić, Tomislav   +1 more
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Circumstellar Dust in Massive Stars

2010
We review observed properties of dust surrounding both hot and cool massive stars. The chemical composition of the dust provides information on the chemical and physical conditions at the time of dust formation, and the geometry of the dust envelope can be used to study the physics of the wind and the interaction between previous and current mass loss.
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Physics and Chemistry of Circumstellar Dust Shells

, 2013
H. Gail, E. Sedlmayr
semanticscholar   +1 more source