Circumstellar chemistry of Si-C bearing molecules in the C-rich AGB star IRC+10216
Paper in proceeding, 2018
Silicon carbide together with amorphous carbon are the main components of dust grains in the atmospheres of C-rich AGB stars. Small gaseous Si-C bearing molecules (such as SiC, SiCSi, and SiC2) are efficiently formed close to the stellar photosphere. They likely condense onto dust seeds owing to their highly refractory nature at the lower temperatures (i.e., below about 2500 K) in the dust growth zone which extends a few stellar radii from the photosphere. Beyond this region, the abundances of Si-C bearing molecules are expected to decrease until they are eventually reformed in the outer shells of the circumstellar envelope, owing to the interaction between the gas and the interstellar UV radiation field. Our goal is to understand the time-dependent chemical evolution of Si-C bond carriers probed by molecular spectral line emission in the circumstellar envelope of IRC+10216 at millimeter wavelengths.
stars: individual (IRC+10216)
(stars:) circumstellar matter
stars: AGB & post-AGB
Author
Luis Velilla Prieto
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Spanish National Research Council (CSIC)
Jose Cernicharo
Spanish National Research Council (CSIC)
M. Agundez
Spanish National Research Council (CSIC)
J.P. Fonfría
Spanish National Research Council (CSIC)
A. Castro-Carrizo
Institut de Radioastronomie Millimétrique (IRAM)
G. Quintana-Lacaci
Spanish National Research Council (CSIC)
N. Marcelino
Spanish National Research Council (CSIC)
M. C. McCarthy
Harvard-Smithsonian Center for Astrophysics
C. A. Gottlieb
Harvard-Smithsonian Center for Astrophysics
C. S. Contreras
Centro de Astrobiologia (CAB)
K. Young
Harvard-Smithsonian Center for Astrophysics
N. Patel
Harvard-Smithsonian Center for Astrophysics
C. Joblin
Paul Sabatier University
Jose Angel Martin-Gago
Spanish National Research Council (CSIC)
Proceedings of the International Astronomical Union
1743-9213 (ISSN) 1743-9221 (eISSN)
Vol. 14 535-537Subject Categories (SSIF 2011)
Astronomy, Astrophysics and Cosmology
Atom and Molecular Physics and Optics
Other Chemistry Topics
DOI
10.1017/S1743921318005410