Collimation of Astrophysical Jets: The Proto-Planetary Nebula He 3-1475

Details Collimation of Astrophysical Jets: The Proto-Planetary Nebula He 3-1475 Collimation of Astrophysical Jets: The Proto-Planetary Nebula He 3-1475

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7285h&link_type=abstract

HST Proposal ID #7285

Astronomy and Astrophysics

Astrophysics

Hst Proposal Id #7285 Stellar Ejecta

Scientific paper

Recent observations of the proto-planetary nebula He3-1475 in the N II Lambda6584 line with the HST WFPC2 have revealed what appear the 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. Morphology alone, however, can be misleading. To confirm this interpretation and make direct comparisons with hydrodynamical models, it is crucial to observe the velocity field of the flow at the highest spatial resolution. We propose to do this by mapping the jets using the long-slit, medium resolution mode of STIS. We also propose supplemental observations: low resolution STIS spectra for nebular diagnostics, narrow-band imaging with WFPC2 in additional emission lines, imaging with NICMOS in the 2.12 Mum H_2 line and broad-band polarimetry with NICMOS and FOC. The polarimetry and H_2 imaging are important to determine the structure of the confining molecular torus close to the star. It is also interesting to n ote that because of its high expansion velocity, a second epoch N II Lambda6584 WFPC2 image should show measurable angular expansion after only a year. This could provide an independent distance.

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