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- W4253146413 abstract "I review the observational evidence relevant to the composition of dust ejected from circumstellar shells. Emphasis is placed on those types of stars believed to be the principal sources of refractory stardust in the interstellar medium. In stars with normal abundances ( O > C ), the predominant species appears to be an amorphous silicate, characterised by smooth spectral features at 9.7 and 19μm, a far infrared emissivity close to unity, and a featureless ultraviolet extinction curve. Similarly, the characteristics of carbon stars ( C > O ) are consistent with the presence of amorphous carbon rather than graphite. Silicon carbide is a minor constituent of carbon-rich stardust and is therefore unlikely to be an important ingredient of interstellar grains. A major goal for future studies will be to establish the evolutionary link between amorphous carbon stardust and the carriers of the unidentified infrared emission features observed in planetary nebulae." @default.
- W4253146413 created "2022-05-12" @default.
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- W4253146413 date "1989-01-01" @default.
- W4253146413 modified "2023-09-25" @default.
- W4253146413 title "The Composition of Dust in Stellar Ejecta" @default.
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- W4253146413 doi "https://doi.org/10.1017/s0074180900125458" @default.
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