Results 221 to 230 of about 386,435 (271)
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Dust in turbulent circumstellar discs

Astrophysics and Space Science, 1993
The ‘collisional model’ for turbulent discs (Hameen-Anttila, 1991) is shown to be equivalent to the α model if the same coefficient of viscosity is adopted in both cases and if an unknown numerical coefficient in the former model is chosen appropriately.
M. Verronen   +2 more
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Mineralogy of Circumstellar Dust

2007
The composition and spatial distribution of circumstellar dust in young and old stars can be used as a probe of the physical and chemical processes that take place. Such studies require a modest spectral resolution in combination with high spatial resolution and large collecting area, now for the first time provided by the new generation of optical ...
L.B.F.M. Waters, Ch. Leinert
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Circumstellar Dust Condensation Scenarios

Astrophysics and Space Science, 1997
Circumstellar dust condensation is a ubiquitously observed phenomenon. Its adequate physical description and quantitative theoretical modelling usually require i) the treatment of the microscopic grain formation processes, and ii) the simultaneous determination of the local physical and chemical conditions by calculating a consistent model structure of
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Molecules and dust in circumstellar shells

Astrophysics and Space Science, 1995
Circumstellar shells provide a unique environment for the study of dust formation and the relation of dust composition to specific atomic and molecular components. As a specific example, the formation of carbonaceous dust is discussed in relation to the presence of polycyclic aromatic hydrocarbon molecules and their survival in the interstellar medium.
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Infrared Interferometry and Circumstellar Dust

AIP Conference Proceedings, 2009
Exozodiacal dust plays an important role for the feasibility and dimensioning of future space missions dedicated to the spectroscopic analysis of the atmosphere of Earth‐like planets. Thus, a survey of dust clouds around potential targets is called for in order to reduce the need for such observations using space‐based missions and not waste time on ...
Vincent Coudé du Foresto   +3 more
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Submillimeter observations of circumstellar dust

Publications of the Astronomical Society of the Pacific, 1992
Five late-type stars with circumstellar envelopes were observed with the James Clark Maxwell Telescope (JCMT) on 1988 Feb. 7-8. The stars IK Tau, Alpha Ori, VY CMa, CW Leo and RW LMi were observed in the 450, 800 and 1100 micron wavebands. These data were combined with existing measurements at shorter wavelengths for each star.
Caroline R. Marshall   +2 more
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Interstellar Dust and Circumstellar Dust Disks

2001
Interstellar dust research belongs to the young branches of astrophysics. With the establishment of sensitive observational techniques in the astronomical infrared spectroscopy in the 1960s, diagnostic circumstellar and interstellar dust bands were detected and induced an explosive development of the whole field.
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Properties of circumstellar silicate dust (Review)

Astronomische Nachrichten, 1989
AbstractWe give a review of the present knowledge on the properties of circumstellar silicate dust. After relating the detection story, a survey of objects with silicate features in their spectra is presented. The interdependence between the optical properties of the dust grains and the structure of the circumstellar envelopes in determining the ...
J. Gürtler, T. H. Henning, J. Dorschner
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