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Unravelling the sulphur chemistry of AGB stars

Published online by Cambridge University Press:  30 December 2019

Taïssa Danilovich Open the ORCID record for Taïssa Danilovich [Opens in a new window]
Taïssa Danilovich*
Affiliation:
Department of Physics and Astronomy, Institute of Astronomy, KU Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium email: [email protected]
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Abstract

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There are clear differences in what sulphur molecules form in AGB circumstellar envelopes (CSEs) across chemical types. CS forms more readily in the CSEs of carbon stars, while SO and SO2 have only been detected towards oxygen-rich stars. However, we have also discovered differences in sulphur chemistry based on the density of the CSE, as traced by mass-loss rate divided by expansion velocity. For example, the radial distribution of SO is drastically different between AGB stars with lower and higher density CSEs. H2S can be found in high abundances towards higher density oxygen-rich stars, whereas SiS accounts for a significant portion of the circumstellar sulphur for higher density carbon stars.

Keywords

stars: AGB and post-AGBcircumstellar matterstars: evolution
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. 379 - 380
Copyright
© International Astronomical Union 2019 

Footnotes

†

Postdoctoral Fellow of the Fund for Scientific Research (FWO), Flanders, Belgium

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