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A study of the close environments of evolved stars from SiO masers

Published online by Cambridge University Press:  01 March 2007

Valentín Bujarrabal ,
J. Alcolea ,
F. Colomer ,
J.-F. Desmurs ,
C. Sánchez Contreras  and
R. Soria-Ruiz
Valentín Bujarrabal
Affiliation:
Observatorio Astronómico Nacional, Apartado 112, E-28803 Alcalá de Henares, Spain email: ([email protected], [email protected])
J. Alcolea
Affiliation:
Observatorio Astronómico Nacional, Calle Alfonso XII 3, E-28014 Madrid, Spain email: ([email protected], [email protected]
F. Colomer
Affiliation:
Observatorio Astronómico Nacional, Apartado 112, E-28803 Alcalá de Henares, Spain email: ([email protected], [email protected])
J.-F. Desmurs
Affiliation:
Observatorio Astronómico Nacional, Calle Alfonso XII 3, E-28014 Madrid, Spain email: ([email protected], [email protected]
C. Sánchez Contreras
Affiliation:
DAMIR, IEM, CSIC, Serrano 121, 28006 Madrid, Spain. email: [email protected]
R. Soria-Ruiz
Affiliation:
JIVE, Postbus 2, 7990 AA Dwingeloo, The Netherlands. email: [email protected]
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Abstract

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SiO maser emission allows us to study the innermost circumstellar layers around AGB and post-AGB stars, at a few AU from the stellar photosphere, what is crucial to understand the mass loss process in AGB stars and the jet launching mechanisms in post-AGB stars. Observations of SiO masers are also useful to address the question of the pumping mechanism itself, still under debate. In particular, VLBI observations of such emissions enables the study of the innermost shells with extremely high spatial resolution, equivalent (in nearby stars) to a few 1012 cm, about one tenth of the stellar radius. In this contribution, recent results on this topic obtained by our group are summarized.

Keywords

stars: AGB and post-AGBcircumstellar matterstars: mass lossstars: variables: long-period variables
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S242: Astrophysical Masers and their Environments , March 2007 , pp. 271 - 278
Copyright
Copyright © International Astronomical Union 2008

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