Colliding Stellar Winds: Near-IR Imaging of the Protoplanetary Nebula M1--92

Details Colliding Stellar Winds: Near-IR Imaging of the Protoplanetary Nebula M1--92 Colliding Stellar Winds: Near-IR Imaging of the Protoplanetary Nebula M1--92

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7839b&link_type=abstract

HST Proposal ID #7839

Computer Science

Hst Proposal Id #7839 Interstellar And Intergalactic Media

Scientific paper

The interaction between a fast post-AGB bipolar outflow and a slowly expanding, dense AGB envelope is believed to be the dominant dynamical effect in the evolution of protoplanetary nebulae {PPNe} and the shaping of planetary nebulae. We are carrying out a multi-wavelength study of the PPN M1-92, to probe each of the important components in the interaction process. Millimeter-wave CO interferometry has revealed that the shock-accelerated, low-energy material is distributed in the thin walls of a double cavity covering the whole nebula, and our WFPC2 optical emission-line images show the presence of highly excited countershocks propagating in a very collimated post-AGB jet within the CO double cavity. We propose complementary NICMOS narrow-band {F212N, F215N}, broad -band {F165M, F222M} and polarimetric {2 Mum POL filters} imaging observations of M1-92 in order {a} to study the intermediate-excitation gas at the interface between the cold molecular and hot atomic gas {identified from our ground-based observations of H_2 vibrational line emission} and perhaps also at the leading bow-shock; {b} to study the concentration of dust around the central star in M1-92, in a 2 arcsec wide region, that may play an important role in the collimation of the fast jets; and {c} to search for a low-luminosity companion which is hypothesized to initiate bipolar symmetry in PPNe.

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