Molecular and dust features of 29 SiC carbon AGB stars
نویسندگان
چکیده
منابع مشابه
Dust from AGB stars
Dust is formed in the expanding atmosphere during late stages of stellar evolution. Dust influences the dynamics and thermodynamics of the stellar atmosphere by its opacity. The dust opacity depends both on the optical properties of the grain material as well as on the amount of dust present. A rich source of information on some mineral phases of dust in AGB stars comes from the study of presol...
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We propose a new mechanism to explain an asymmetric mass loss for C-rich asymptotic giant branch (AGB)stars based on the effect how rotation modifies dust driven winds. Even small deviations from spherical symmetry introduced by slow rotations are amplified in the zone of dust condensation due to the non-linear behaviour and the strong temperature and density dependence of the dust formation pr...
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Twelve IRAS sources in the LMC with colours similar to those expected for dust-enshrounded AGB stars have been monitored in the infrared for 1880 days. The objects come from the list of Reid (1991). Nine of these objects are large amplitude variables with periods in the range 530 to 1295 days. The variability confirms their status as dust-enshrouded AGB stars. Combined with the results of Wood ...
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Stars on the asymptotic giant branch (AGB) produce dust in their circumstellar shells. The nature of the dust-forming environment is influenced by the evolution of the stars, in terms of both chemistry and density, leading to an evolution in the nature of the dust that is produced. Carbon-rich AGB stars are known to produce silicon carbide (SiC). Furthermore, observations of the ∼11μm SiC featu...
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We construct a data base of 125 post-AGB objects (including R CrB and extreme helium stars) with published photospheric parameters (effective temperature and gravity) and chemical composition. We estimate the masses of the postAGB stars by comparing their position in the (log Teff , log g) plane with theoretical evolutionary tracks of different masses. We construct various diagrams, with the ai...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2004
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20031673