Mathematics – Logic
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6502b&link_type=abstract
HST Proposal ID #6502
Mathematics
Logic
Hst Proposal Id #6502 Interstellar Medium
Scientific paper
Understanding the physics of bipolar nebulae, our high-level goal, is a key means of probing the mass loss history of stars from their youngest {YSOs, HH objects} to their most evolved stages {planetary nebulae, PNe and LBVs}. High-spatial resolution WFPC2 images of easily observed bipolars - specifically, very bright bipolar PNe - provide detailed snapshots of evolving bipolars. We propose to obtain narrow- band WFPC2 images with a critical spatial resolution of 10^15 cm, to be coupled with ground-based measurements of the internal kinematics, in order to provide crucial constraints for the numerical hydro codes which we have been developing for a decade. There are two secondary goals. The geometry and density of the elusive disks surrounding the nuclear wind source almost certainly ordains the morphological fate of a bipolar nebula from its earliest state of evolution. We propose to detect and characterize these disks. Also, the same WFPC2 images will allow us to search directly for strong filamentary shocks in the lobes of PNs. The shocks cannot be isolated without spatial resolutions 0."1. Models predict that such shocks are highly oblique and therefore weak; however, a growing body of ground-based spectrophotometric measurements seem to suggest that shocks are bright, and that they play a significant role in the nebular structure, energetics, and evolution.
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