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Masers in evolved star winds

Published online by Cambridge University Press:  24 July 2012

Anita M. S. Richards
Anita M. S. Richards*
Affiliation:
UK ARC Node, JBCA, School of Physics and Astronomy, University of Manchester, UK email: amsr@jb.man.ac.uk
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Abstract

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This review summarises current observations of masers around evolved stars and models for their location and behaviour, followed by some of the many highlights from the past 5 years. Some of these have been the fruition of long-term monitoring, a vital aspect of study of stars which are both periodically variable and prone to rapid outbursts or transition to a new evolutionary stage. Interferometric imaging of masers provide the highest-resolution probes of the stellar wind, but their exponential amplification and variability means that multiple observations are needed to investigate questions such as what drives the wind from the stellar surface; why does it accelerate slowly over many tens of stellar radii; what causes maser variability. VLBI parallaxes have improved our understanding of individual objects and of Galactic populations. Masers from wide range of binary and post-AGB objects are accessible to sensitive modern instruments, including energetic symbiotic systems. Masers have been detected up to THz frequencies with Herschel and ALMA's ability to resolve a wide range of maser and thermal lines will provide accurate constraints on physical conditions including during dust formation.

Keywords

maserssurveysstars: distanceslate-typeevolutionAGB and post-AGBsupergiantsbinaries: symbioticGalaxy: kinematics and dynamics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S287: Cosmic Masers - from OH to H0 , January 2012 , pp. 199 - 208
Copyright
Copyright © International Astronomical Union 2012

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