Other
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12227s&link_type=abstract
HST Proposal ID #12227. Cycle 18
Other
Scientific paper
The carbon star V Hydra is experiencing heavy mass loss as it undergoes the transition from AGB star to pre-planetary nebula. This is possibly the earliest object known in this brief phase, which is so short that few nearby stars are likely to be caught in the act. Molecular observations reveal that a bipolar nebula has been established even at this early stage. Using STIS, in Jan 2002, we discovered a high-velocity {> 200 km/s} jet or blob of gas in V Hya which had been ejected a few years prior from near the star. 2nd and 3rd epoch STIS observations over 2 years clearly revealed both its proper motion and strong deceleration. We propose STIS monitoring of this remarkable event over a period of 3 years, in order to obtain a precise dynamical and cooling history of this blob and any successor blobs that may have been ejected since then. This ejection event is likely to hold the key to understanding why initially spherical mass outflows adopt a bipolar geometry during the post-AGB phase of stellar evolution. The goal is to understand the interaction of the blobby jet outflow with the ambient circumstellar medium. We not only have the opportunity to look on as the circumstellar envelope is sculpted by this and perhaps other collimated mass ejections, but we also have an unprecedented chance to constrain the mechanism for mass ejection, and thereby help solve the long-standing puzzle of how the spherical mass-loss envelopes of AGB stars evolve into bipolar planetary nebulae.;
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