Maser emission during post-AGB evolution

Abstract

This contribution reviews recent observational results concerning astronomical masers toward post-AGB objects with a special attention to water fountain sources and the prototypical source OH231.8+4.2. These sources represent a short transition phase in the evolution between circumstellar envelopes around asymptotic giant branch stars and planetary nebulae. The main masing species are considered and key results are summarized.

8 pages, 4 figures, invited review, Proc. IAU Symp. 287 "Cosmic Masers: from OH to H0", R.S. Booth, E.M.L. Humphreys and W.H.T. Vlemmings, eds

References in corpus (6)

• A magnetically collimated jet from an evolved star
• H2O Maser Observations of Candidate Post-AGB Stars and Discovery of Three High-velocity Water Sources
• The spatio-kinematical structure and distance of the pre-planetary nebula IRAS 19134+2131
• The Motion of Water Masers in the Pre-Planetary Nebula IRAS 16342-3814
• VLA observations of the "water fountain" IRAS 16552-3050
• The compact circumstellar material around OH 231.8+4.2