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The Maser-emitting Structure and Time Variability of the SiS Lines J=14−13 and 15-14 in IRC+10216

Published online by Cambridge University Press:  30 December 2019

J. P. Fonfría Open the ORCID record for J. P. Fonfría [Opens in a new window] ,
M. Fernández-López ,
J. R. Pardo ,
M. Agúndez ,
C. Sánchez Contreras ,
L. Velilla-Prieto ,
J. Cernicharo Open the ORCID record for J. Cernicharo [Opens in a new window] ,
M. Santander-García ,
G. Quintana-Lacaci  and
A. Castro-Carrizo
...Show all authors
J. P. Fonfría
Affiliation:
Molecular Astrophysics Group, Instituto de Física Fundamental, CSIC, C/ Serrano, 123, 28006, Madrid (Spain) email: jpablo.fonfria@csic.es
M. Fernández-López
Affiliation:
Instituto Argentino de Radioastronomía, CCT-La Plata (CONICET), C.C.5, 1894, Villa Elisa (Argentina)
J. R. Pardo
Affiliation:
Molecular Astrophysics Group, Instituto de Física Fundamental, CSIC, C/ Serrano, 123, 28006, Madrid (Spain) email: jpablo.fonfria@csic.es
M. Agúndez
Affiliation:
Molecular Astrophysics Group, Instituto de Física Fundamental, CSIC, C/ Serrano, 123, 28006, Madrid (Spain) email: jpablo.fonfria@csic.es
C. Sánchez Contreras
Affiliation:
Department of Astrophysics, Astrobiology Center (CSIC-INTA), Postal address: ESAC campus, P.O. Box 78, E-28691, Villanueva de la Cañada, Madrid (Spain)
L. Velilla-Prieto
Affiliation:
Molecular Astrophysics Group, Instituto de Física Fundamental, CSIC, C/ Serrano, 123, 28006, Madrid (Spain) email: jpablo.fonfria@csic.es
J. Cernicharo
Affiliation:
Molecular Astrophysics Group, Instituto de Física Fundamental, CSIC, C/ Serrano, 123, 28006, Madrid (Spain) email: jpablo.fonfria@csic.es
M. Santander-García
Affiliation:
Observatorio Astronómico Nacional, OAN-IGN, Alfonso XII, 3, E-28014, Madrid (Spain)
G. Quintana-Lacaci
Affiliation:
Molecular Astrophysics Group, Instituto de Física Fundamental, CSIC, C/ Serrano, 123, 28006, Madrid (Spain) email: jpablo.fonfria@csic.es
A. Castro-Carrizo
Affiliation:
Institut de Radioastronomie Millimétrique, 300 Rue de la Piscine, 38406 Saint-Martin d’Hères (France)
S. Curiel
Affiliation:
Departamento de Astrofísica Teórica, Instituto de Astronomía, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510, Mexico City (Mexico)
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Abstract

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AGB stars are important contributors of processed matter to the ISM. However, the physical and chemical mechanisms involved in its ejection are still poorly known. This process is expected to have remarkable effects in the innermost envelope, where the dust grains are formed, the gas is accelerated, the chemistry is active, and the radiative excitation becomes important. A good tracer of this region in C-rich stars is SiS, an abundant refractory molecule that can display maser lines, very sensitive to changes in the physical conditions. We present high angular resolution interferometer observations (HPBW ≳0.″.25) of the v = 0 J = 14 – 13 and 15 – 14 SiS maser lines towards the archetypal AGB star IRC+10216, carried out with CARMA and ALMA to explore the inner 1” region around the central star. We also present an ambitious monitoring of these lines along one single pulsation period carried out with the IRAM 30 m telescope.

Keywords

line: profilesmasersradiative transfertechniques: high angular resolutiontechniques: interferometric(stars:) circumstellar matterstars: individual (IRC+10216)
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. 398 - 399
Copyright
© International Astronomical Union 2019 

References

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