Hostname: page-component-7c8c6479df-995ml Total loading time: 0 Render date: 2024-03-29T11:00:36.845Z Has data issue: false hasContentIssue false

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

Published online by Cambridge University Press:  01 March 2007

Valentín Bujarrabal
Affiliation:
Observatorio Astronómico Nacional, Apartado 112, E-28803 Alcalá de Henares, Spain email: (v.bujarrabal@oan.es, f.colomer@oan.es)
J. Alcolea
Affiliation:
Observatorio Astronómico Nacional, Calle Alfonso XII 3, E-28014 Madrid, Spain email: (j.alcolea@oan.es, jf.desmurs@oan.es
F. Colomer
Affiliation:
Observatorio Astronómico Nacional, Apartado 112, E-28803 Alcalá de Henares, Spain email: (v.bujarrabal@oan.es, f.colomer@oan.es)
J.-F. Desmurs
Affiliation:
Observatorio Astronómico Nacional, Calle Alfonso XII 3, E-28014 Madrid, Spain email: (j.alcolea@oan.es, jf.desmurs@oan.es
C. Sánchez Contreras
Affiliation:
DAMIR, IEM, CSIC, Serrano 121, 28006 Madrid, Spain. email: carmen@damir.iem.csic.es
R. Soria-Ruiz
Affiliation:
JIVE, Postbus 2, 7990 AA Dwingeloo, The Netherlands. email: soria@jive.nl
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2008

References

Alcolea, J., Bujarrabal, V. & Gómez-González, 1990, A&A 231, 431Google Scholar
Bujarrabal, V., Planesas, P. & Del Romero, A., 1987, A&A 175, 164Google Scholar
Bujarrabal, V. 1994, A&A 285, 953Google Scholar
Bujarrabal, V., Alcolea, J., Sánchez Contreras, C. & Colomer, F. 1996, A&A 314, 883Google Scholar
Bujarrabal, V., Castro-Carrizo, A., Alcolea, J. & Sánchez Contreras, C. 2001, A&A 377, 868Google Scholar
Cotton, W. D., Mennesson, B., Diamond, P. J., et al. 2004, ApJ 414, 275Google Scholar
Cotton, W. D., Vlemmings, W., Mennesson, B., et al. 2006, ApJ 456, 339Google Scholar
Deguchi, S., Good, J., Fan, Y. et al. 1983, ApJ 264, L65CrossRefGoogle Scholar
Deguchi, S. & Nguyen-Q-Rieu, 1983, A&A 117, 314Google Scholar
Deguchi, S. 2007, in: Chapman, J. & Baan, W. (eds.), Astrophysical Masers and their Environments, Proceedings IAU Symp. No 242 (Cambridge University Press)Google Scholar
Desmurs, J.-F., Bujarrabal, V., Colomer, F., & Alcolea, J. 2000 A&A 360, 189Google Scholar
Desmurs, J.-F., Alcolea, J., Bujarrabal, V., Sánchez Contreras, C., & Colomer, F. 2007a, A&A, in pressGoogle Scholar
Desmurs, J.-F. 2007b in: Chapman, J. & Baan, W. (eds.), Astrophysical Masers and their Environments, Proceedings IAU Symp. No 242 (Cambridge University Press)Google Scholar
Elitzur, M. 2007 in: Chapman, J. & Baan, W. (eds.), Astrophysical Masers and their Environments, Proceedings IAU Symp. No 242 (Cambridge University Press)Google Scholar
Frank, A. & Blackman, E. G. 2004, ApJ 614, 737CrossRefGoogle Scholar
Humphreys, E. M. L., Gray, M. D., Yates, J. A. et al. 2002, A&A 386, 256Google Scholar
Kemball, A. 2007 in: Chapman, J. & Baan, W. (eds.), Astrophysical Masers and their Environments, Proceedings IAU Symp. No 242 (Cambridge University Press)Google Scholar
Kwan, J. Y. & Scoville, N. 1974 ApJ 194, L97CrossRefGoogle Scholar
Lockett, P. & Elitzur, M. 1992, ApJ 394, 704CrossRefGoogle Scholar
Miyoshi, M., Matsumoto, K., Kameno, S., Takaba, H., & Iwata, T. 1994, Nature 371, 395CrossRefGoogle Scholar
Olofsson, H., Rydbeck, O. E. H. & Nyman, L.-A. 1985, A&A 150, 169Google Scholar
Pardo, J. R., Alcolea, J., Bujarrabal, V. et al. 2004, A&A 424, 145Google Scholar
Robinson, S. E. & Van Blerkom, D. J., 1981, ApJ 249, 566CrossRefGoogle Scholar
Sánchez Contreras, C., Desmurs, J.-F., Bujarrabal, V., Alcolea, J., & Colomer, F. 2002 A&A 385, L1Google Scholar
Soria-Ruiz, R., Alcolea, J., Colomer, F. et al. , 2004, A&A 426, 131Google Scholar
Soria-Ruiz, R., Colomer, F., Alcolea, J. et al. , 2005, A&A 432, L39Google Scholar