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Bipolar jet from AGB star WX Psc (vol.30: 2007.5.25)

Some planetary nebulae show bipolar jet from their center, but when and how such bipolar flow is formed is still a question.
WX Psc is an Asymptotic Giant Branch star and is expected that it may be forming a bipolar jet as it is drastically losing its mass at an evolutional stage prior to a planetary nebula.

Inomata et al.(2007) observed WX Psc H2O masers with VERA and successfully obtained the maser spot distributions as well as their velocity structure.
Their results showed that maser spot orientation is basically in the north-south direction, being different from what is expected from optical/infrared observations.

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