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Maser Observations of Cool Stars

Published online by Cambridge University Press:  26 May 2016

E.M.L. Humphreys
E.M.L. Humphreys*
Affiliation:
Onsala Space Observatory, Chalmers University of Technology, Sweden, S-43992

Abstract

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SiO, H2O and OH masers are ubiquitous in the circumstellar envelopes (CSEs) of oxygen-rich, red giant stars. Radio interferometry allows the imaging of stellar maser emission down to sub-milliarcsecond scales. Such observations reveal asymmetry, inhomogeneity and apparent clumpiness in the extended atmosphere and surrounding envelope of the star. The studies place constraints on processes which are seldom included in models. Here, I review the observational data on stellar masers and discuss their implications for our understanding of the mass-loss and evolution of red giant stars.

Type
Session F. Winds - Cool and Pulsating Stars
Information
Symposium - International Astronomical Union , Volume 210: Modelling of Stellar Atmospheres , 2003 , pp. 377 - 386
Copyright
Copyright © Astronomical Society of the Pacific 2003 

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