Highly collimated fast bipolar jets from dying stars:  lessons learned for outflows from young stellar objects

Hiroshi Imai  (Kagoshima University)

Some of cosmic jets are launched from dying stars as well as young stellar objects and active galactic nuclei. Such jets from dying stars are basically isolated and all the material driving the jets should have been supplied from the envelope of the stellar system. Therefore, these jets also provide some clues of basic aspects of cosmic jets such as their launching mechanism and effects on the surrounding environments.  

Here we introduce "water fountain sources", which are such jets but hosting water masers. Because of the dynamical timescale of the maser sources within ~100 yr, it is expected to observe the life of such jets during the lifetime of our human being. We will present the results of single-dish and interferometer observations of those water fountain sources and provide some prospectives.