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Observational Constraints on Silicon Chemistry in the Circumstellar Envelopes of Red Giants
Published online by Cambridge University Press: 04 August 2017
Abstract
We review observations to date of silicon-bearing molecules in circumstellar gas and dust around red giants. New constraints on circumstellar chemistry are provided by the discovery of (i) a systematic decrease in the [SiO]/[H2] ratio with mass loss rate, ii) SiO in carbon-rich CIT 6. The presence/absence of SiO maser emission in oxygen-rich/carbon-rich envelopes is linked to differences in grain composion and the grain-condensation radius.
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- Circumstellar Shells
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- Copyright © Reidel 1987