Results 141 to 150 of about 772 (182)
Some of the next articles are maybe not open access.
Molecules and dust in circumstellar shells
Astrophysics and Space Science, 1995Circumstellar 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.
openaire +1 more source
Mineralogy of Circumstellar Dust
2007The 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
openaire +1 more source
Circumstellar Dust in Symbiotic Novae
EAS Publications Series, 2015We present a model of inner dust regions around the cool Mira component of the two symbiotic novae, RR Tel and HM Sge, based on the near-IR photometry, ISO spectra and mid-IR interferometry. The dust properties were determined using the DUSTY code. A compact circumstellar silicate dust shell with inner dust shell temperatures between 900 K and 1300 K ...
Jurkić, Tomislav +1 more
openaire +1 more source
Infrared Interferometry and Circumstellar Dust
AIP Conference Proceedings, 2009Exozodiacal 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
openaire +2 more sources
Circumstellar Dust Condensation Scenarios
Astrophysics and Space Science, 1997Circumstellar 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
openaire +1 more source
Interstellar Dust and Circumstellar Dust Disks
2001Interstellar 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.
openaire +1 more source
Dust in turbulent circumstellar discs
Astrophysics and Space Science, 1993The ‘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
openaire +1 more source
TEM studies of circumstellar dust
Proceedings, annual meeting, Electron Microscopy Society of America, 1992In 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 ...
openaire +1 more source
Submillimeter observations of circumstellar dust
Publications of the Astronomical Society of the Pacific, 1992Five 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
openaire +1 more source