High-Velocity Collimated Outflows and Equatorial Toroids in Cool Stars: A Study of V Hydrae and PI^1 Gru

Details High-Velocity Collimated Outflows and Equatorial Toroids in Cool Stars: A Study of V Hydrae and PI^1 Gru High-Velocity Collimated Outflows and Equatorial Toroids in Cool Stars: A Study of V Hydrae and PI^1 Gru

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9100s&link_type=abstract

HST Proposal ID #9100

Physics

Hst Proposal Id #9100 Cold Stars

Scientific paper

The two cool red giant stars V Hya and PI^1 Gru show strong observational evidence for the presence of high-velocity collimated outflows and equatorial toroids, both of which have been postulated to play significant roles in the formation of bipolar planetary nebulae. However the limited resolution of existing ground-based observations makes it impossible to unambiguously identify structures which reveal the mechanism of jet formation or elucidate the cause of bipolarity. We propose HST imaging and long-slit spectroscopic observations of the circumstellar environment of V Hya and PI^1 Gru. These observations will provide the first high-resolution images at any wavelength of these key objects. We will thus obtain an unprecedentedly high-resolution glimpse of AGB stars transitioning into preplanetary nebulae, allowing us to probe the structure and kinematics of their very fast outflows and the relationship of those outflows to the structures seen in molecular line emission. Our HST study of these transition objects should elucidate the nature and history of the mass- loss processes which terminate the AGB evolution of intermediate-mass stars and begin their transition into the proto-planetary and planetary nebula phases.

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