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The Abundance of SiC2 in Carbon Star Envelopes

Published online by Cambridge University Press:  04 September 2018

Sarah Massalkhi ,
M. Agúndez ,
J. Cernicharo ,
J. P. Fonfría  and
M. Santander-García
Sarah Massalkhi
Affiliation:
Grupo de Astrofísica Molecular, Instituto de Ciencia de Materiales de Madrid, CSIC C/ Sor Juana Inés de la Cruz 3, 28049 Cantoblanco, Spain
M. Agúndez
Affiliation:
Grupo de Astrofísica Molecular, Instituto de Ciencia de Materiales de Madrid, CSIC C/ Sor Juana Inés de la Cruz 3, 28049 Cantoblanco, Spain
J. Cernicharo
Affiliation:
Grupo de Astrofísica Molecular, Instituto de Ciencia de Materiales de Madrid, CSIC C/ Sor Juana Inés de la Cruz 3, 28049 Cantoblanco, Spain
J. P. Fonfría
Affiliation:
Grupo de Astrofísica Molecular, Instituto de Ciencia de Materiales de Madrid, CSIC C/ Sor Juana Inés de la Cruz 3, 28049 Cantoblanco, Spain
M. Santander-García
Affiliation:
Grupo de Astrofísica Molecular, Instituto de Ciencia de Materiales de Madrid, CSIC C/ Sor Juana Inés de la Cruz 3, 28049 Cantoblanco, Spain
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Abstract

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Silicon carbide dust grains are ubiquitous in circumstellar envelopes around C-rich AGB stars. However, the main gas-phase precursors leading to the formation of SiC dust have not yet been identified. To date, only three molecules containing an Si–C bond have been identified to have significant abundances in C-rich AGB stars: SiC2, SiC, and Si2C. The ring molecule SiC2 has been observed in a handful of evolved stars, while SiC and Si2C have only been detected in the C-star envelope IRC +10216. We aim to study how widespread and abundant SiC2, SiC, and Si2C are in envelopes around C-rich AGB stars and whether or not these species play an active role as gas-phase precursors of silicon carbide dust in the ejecta of carbon stars.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S332: Astrochemistry VII: Through the Cosmos from Galaxies to Planets , March 2017 , pp. 261 - 269
Copyright
Copyright © International Astronomical Union 2018 

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