Results 181 to 190 of about 293,009 (201)
On the Coupling of Grains to the Gas in Circumstellar Envelopes
Astrophysical Journal, 1972 exaly +2 more sources
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The origin of circumstellar silicon carbide grains found in meteorites
Meteoritics, 1995Abstract— Condensation calculations for C‐rich circumstellar envelopes are used to model the condensation sequence of C, TiC, and SiC, and trace‐element patterns observed in circumstellar SiC grains. Some properties of carbon star envelopes are briefly discussed, and condensation temperatures for major and trace elements are computed for a wide array ...
B Fegley
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Extinction and Abundance Properties of Alpha Scorpii Circumstellar Grains
Astrophysical Journal, 1987 The UV extinction and element depletions in the circumstellar envelope Alpha Sco are investigated using IUE, Copernicus, and AS data of Alpha Sco B which can be seen in absorption through the cool-star envelope. The circumstellar reddening, depletions, and spectral extinction toward Alpha Sco B are estimated.
J P Swings
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Astronomy and Astrophysics, 2006 Aims.New SiO multi-transition millimetre line observations of a sample of carbon stars, including J = $8\rightarrow7$ observations with the APEX telescope, are used to probe the role of non-equilibrium chemistry and the influence of grains in ...
H Olofsson, F L Schoier
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Interstellar and circumstellar grain formation and survival
Philosophical Transactions Series A, Mathematical, Physical, and Engineering Sciences, 2001Dust formation is primarily associated with stars in their dying throes, e.g. when low–mass stars reach the red–giant or asymptotic–giant branch (AGB) phase of their evolution, or when massive stars explode as supernovae (SNe). While the contribution of AGB stars to the galactic dust budget is significant, both in terms of variety and quantity, that ...
Anthony P. Jones
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Stability of amorphous circumstellar silicate grains
Astronomische Nachrichten, 1986AbstractBerechnungen innerhalb der klassischen Nukleationstheorie zeigen, daß Mg2SiO4‐Staubteilchen mit Radien von etwa 0,1 μm, die sich mit hoher Wahrscheinlichkeit im zirkumstellaren Raum um Sterne späten Spektraltyps bilden, bei etwa 750 K auskondensieren müssen, um amorph zu bleiben.
Th. Henning, J. Svatoš
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Probing dust grain evolution in IM Lupi's circumstellar disc
Astronomy and Astrophysics, 2008 Aims. We present a panchromatic study, involving a multiple technique approach, of the circumstellar disc surrounding the T Tauri star IM Lupi (Sz 82). Methods. We have undertaken a comprehensive observational study of IM Lupi using photometry, spectroscopy, millimetre interferometry and multi-wavelength imaging.
Christophe Pinte +2 more
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Diagnostics of circumstellar grains in geometric models I: structure and composition [PDF]
Monthly Notices of the Royal Astronomical Society, 2017 Jane Greaves +1 more
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The Infrared Characteristics of Circumstellar Silicate Grains
1985We have made a theoretical study of the infrared emission from circumstellar shells around late-type giants, with the aim of deriving the infrared characteristics of the silicate grains condensing in these shells. A large grid of models has been compared with observations of optically visible Miras, IRC sources and OH/IR stars.
W. Schutte, A. G. G. M. Tielens
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Optical properties of circumstellar silicate grains
Astrophysics and Space Science, 1991The optical properties of circumstellar silicate dust grains around oxygen-rich giant stars are investigated with close attention to infrared observations of OH/IR stars. The optical constants are deduced from available astronomical and laboratory data.
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