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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

Raghvendra Sahai
Raghvendra Sahai*
Affiliation:
Millimeter Wave Observatory, Department of Astronomy, University of Texas, Austin, TX 78712

Abstract

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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.

Type
Circumstellar Shells
Information
Symposium - International Astronomical Union , Volume 120: Astrochemistry , 1987 , pp. 341 - 342
Copyright
Copyright © Reidel 1987