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Session 7 - Planetary & Other Nebulae.
Display session, Monday, June 09
South Main Hall,

[7.05] Collimation of Astrophysical Jets: the Proto-Planetary Nebula He 3-1475

K. J. Borkowski, J. M. Blondin (NCSU), J. P. Harrington (UMD)

The proto-planetary nebula He 3-1475 was imaged in the [N II] 6584 line with the Wide Field Planetary Camera 2 on board the Hubble Space Telescope (HST). This image has revealed what appear to be large scale flows being collimated into narrow bipolar jets. This is a unique object: we may be observing the actual collimation process of an astrophysical jet. Analytical models and hydrodynamical simulations suggest that the jets in He 3-1475 may be produced by purely hydrodynamical means, through focusing of a weakly-collimated bipolar outflow into jets by oblique radiative shocks. We will show our two- and three-dimensional hydrodynamical simulations of this jet formation process.

In our snapshot HST survey for jets in planetary nebulae (PN), we also imaged an enigmatic nebula NGC 6210, a point-symmetric PN Hb 4, and a young bipolar PN Hu 2-1. We will present HST images of these PNe: NGC 6210 appears as a complex mass of emission knots located asymmetrically with respect to the central star, and also features an outlying "bullet". Hb 4 possesses a beautiful pair of curlicue ansae, while a number of structures and outflows at different position angles are seen in the bright PN Hu 2-1.

Program listing for Monday