Panoramic Views Of Water Fountain Sources

Panoramic Views of Water Fountain SourcesHiroshi Imai

Graduate School of Science and EngineeringKagoshima University

A Neapolitan of Masers: Variability, Magnetism and VLBI 20 May 2013, CSIRO CASS, AustraliaWater fountainhighly collimated, fast, stellar, molecular jet from AGB to post-AGB star, from spherical symmetric to asymmetric circumstellar envelope

Egg Nebula (post-AGB star) NASABetelgeuse (Mira variable) NASA

W43A (OH/IR star)water fountain Deguchi et al. 2007

H2O maser spectrum(Likkel et al. 1992)2Masers in water fountainsDynamical centers within 70 AUSystemic velocities within 3 km/sH2O and OH masers(Imai et al. 2002)SiO and H2O masers(Imai et al. 2005)

SPITZER/GLIMPSE image around W43A (Deguchi et al. 2007)

VLT 11.85 micron image of W43A (Lagadec et al. 2011)

3Mechanism of stellar jet launchSee Vlemmingss talk about magnetic fieldMechanism of planetary nebula shaping by jetCharacter of stellar system: single star v.s. binary

Dynamical time scales: tdyn(H2O)=l/vexp