Physics
Scientific paper
Feb 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008noao.prop..454h&link_type=abstract
NOAO Proposal ID #2008A-0454
Physics
Scientific paper
We propose to use the H_2 1-0 S(1) emission line at 2.12 (micron) to measure the kinematics in the interaction zone between the fast wind and the slower AGB wind in bipolar proto-planetary nebulae (PPNs). This will help us to understand the processes that shape the lobes. The bipolar shape of many PNs and PPNs is attributed to collimation of the fast wind by a high density torus around the star. H_2 emission in PPNs has been seen arising at the ends and edges of the lobes, consistent with the expectation that it is collisionally excited. Measurements of the H_2 velocity will sample the conditions in the lobes. In this proposal, we request very high-resolution, long-slit Phoenix H_2 spectral observations of 4 small, spatially-resolved PPNs. For all of them, we have high-resolution H_2 images from HST or with AO from Gemini-N that show the spatial locations of the emission. These observations will provide crucial insights into the development of the lobes and the fast outflows that are shaping them. This was demonstrated in 4 larger PPNs that we recently studied.
Hrivnak Bruce J.
Smith Nathan
Volk Kevin
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