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Circumstellar dust, IR spectroscopy, and mineralogy

Published online by Cambridge University Press:  30 December 2019

Kyung-Won Suh Open the ORCID record for Kyung-Won Suh [Opens in a new window]
Kyung-Won Suh*
Affiliation:
Dept. of Astronomy and Space Science, Chungbuk National University, Cheongju, Chungbuk 28644, Republic of Korea email: kwsuh@chungbuk.ac.kr
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Abstract

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We review the mineralogy of circumstellar dust grains around AGB stars as investigated through infrared spectroscopic studies. The expanding envelopes of AGB stars are chemically fresh because of the strong binding force of CO molecules. O-rich dust grains (silicates and oxides) form in O-rich envelopes and C-rich dust grains (amorphous carbon and SiC) form in C-rich envelopes. Amorphous silicate grains can be crystallized by annealing processes in various environments of AGB stars. We also discuss dust mineralogy for objects that have undergone chemical transition processes.

Keywords

circumstellar matterstars: AGB and post-AGBdust-extinctioninfrared: starsradiative transfer
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S343: Why Galaxies Care About AGB Stars: A Continuing Challenge through Cosmic Time , August 2018 , pp. 159 - 163
Copyright
© International Astronomical Union 2019 

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