Proc. IAU volume 13, issue S336, P341-346 2017 DOI: 10.1017/s1743921317009620 View full text
Hiroshi Imai

Abstract: AbstractThe brightness of maser features are fascinating and give valuable insight for circumstellar physics of oxygen-rich, intermediate-mass stars, in particular the final evolution of circumstellar envelopes (CSEs). The variety of accompanying masers such as SiO, H2O, and OH in the CSEs may provide unique probes into different stages of rapid CSE evolution. However, with only sparse monitoring of these masers one can sometimes find it difficult to accurately interpret their spatio-kinematics, origins and ex…

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