Circumstellar chemistry of Si-C bearing molecules in the C-rich AGB star IRC+10216
Artikel i vetenskaplig tidskrift, 2019

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: AGB & post-AGB

(stars:) circumstellar matter

stars: individual (IRC+10216)

Författare

Luis Velilla Prieto

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Galaktisk astrofysik

CSIC - Instituto de Fisica Fundamental (IFF)

Jose Cernicharo

CSIC - Instituto de Fisica Fundamental (IFF)

M. Agundez

CSIC - Instituto de Fisica Fundamental (IFF)

J.P. Fonfría

CSIC - Instituto de Fisica Fundamental (IFF)

A. Castro-Carrizo

Institut de Radioastronomie Millimétrique (IRAM)

G. Quintana-Lacaci

CSIC - Instituto de Fisica Fundamental (IFF)

N. Marcelino

CSIC - Instituto de Fisica Fundamental (IFF)

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

Universite Paul Sabatier Toulouse III

Jose Angel Martin-Gago

CSIC - Instituto de Ciencia de Materiales de Madrid (ICMM)

Proceedings of the International Astronomical Union

1743-9213 (ISSN) 1743-9221 (eISSN)

Vol. in press 535-537

Ämneskategorier

Astronomi, astrofysik och kosmologi

Atom- och molekylfysik och optik

Annan kemi

DOI

10.1017/S1743921318005410

Mer information

Senast uppdaterat

2020-11-09