Unveiling the origin of post-AGB winds through STIS data

Details Unveiling the origin of post-AGB winds through STIS data Unveiling the origin of post-AGB winds through STIS data

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9554c&link_type=abstract

HST Proposal ID #9554

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Hst Proposal Id #9554 Ism And Circumstellar

Scientific paper

The impact of fast, collimated jets on the spherical and slowly expanding circumstellar envelopes of AGB stars, is believed to be responsible for the remarkable bipolarity and high axial-velocities observed in most post-AGB objects {protoplanetary and planetary nebulae}. We have recently discovered inner, post-AGB jets in the prototype protoplanetary nebula He 3-1475, through a preliminary analysis of STIS long-slit spectra. The high-spatial resolution achieved by the HST and the spectroscopic capabilities of STIS have allowed us for the first time to study the spatio-kinematic structure of post-AGB jets in the stellar vicinity, before they have been strongly altered by the interaction with the AGB shell. Such a study is crucial for understanding the {unknown} mechanism that powers and collimate the winds of post-AGB stars. We request funding to perform a comprehensive study of the STIS spectra for the whole set of slits and gratings available for He 3-1475 and another well studied PPN, HD 44179. A preliminary inspection of the data reveals also in this source, a fast, bipolar outflow at 40 A.U. from the star. This is the first time that post-AGB winds are seen at such small scale. A detailed anaysis of the STIS data is needed to tightly constraint the physical properties of the post-AGB jets and, ultimately, to understand their origin.

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