Snapshot Survey of Proto-planetary Nebulae and AGB stars

Details Snapshot Survey of Proto-planetary Nebulae and AGB stars Snapshot Survey of Proto-planetary Nebulae and AGB stars

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6364b&link_type=abstract

HST Proposal ID #6364

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Hst Proposal Id #6364 Hot Stars

Scientific paper

We propose to undertake a snapshot survey of AGB stars and proto-planetary nebulae {PPNe} in order to discern the evolutionary sequence that produces axially symmetric planetary nebulae {PNe}. It is now well established that most PNe are axially symmetric. However, the origin of this axial symmetry remains a topic of current research. Our snapshot survey addresses two aspects of this issue: at which point in the intermediate mass star's evolution does the axial symmetry arise and do binary companions play an important role in creating this axial symmetry. The survey, using a list of approximately 40 candidate targets, will show AGB and PPNe circumstellar envelopes {CSEs} in various stages of development resulting in a database of images from which meaningful statistics can be derived on the evolutionary stage at which the axial symmetry originates. In addition, some binary companions may be detected. The objects in this survey overlap with those imaged in a high resolution {<0.9"} mid-infrared imaging study by Meixner et al. Our proposed HST snapshot survey will complement the mid-IR survey in wavelength and spatial resolution. In particular, the high angular resolution of HST will permit us to investigate the structure of CSEs from an earlier stage of development than has been possible in the mid-IR.

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