Computer Science
Scientific paper
Nov 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003natur.426..261s&link_type=abstract
Nature, Volume 426, Issue 6964, pp. 261-264 (2003).
Computer Science
31
Scientific paper
Stars with masses in the range 1-8 solar masses (M&sun;) live ordinary lives for ~109-1010 years, but die extraordinary deaths. First, during their death throes as asymptotic giant branch (AGB) stars they eject, over 104-105 years, half or more of their mass in slowly expanding, spherical winds, and then, in a short (a few 100-1,000 years) and poorly understood phase, they are transformed into aspherical planetary nebula. Recent studies support the idea that high-speed, jet-like flows play a crucial role in this transformation. Evidence for such outflows is indirect, however; this phase is so short that few nearby stars are likely to be caught in the act. Here we report the discovery of a newly launched, high-speed jet-like outflow in the nearby AGB star, V Hydrae. We have detected both proper motions and ongoing evolution in the jet. These results support a model in which the jet is driven by an accretion disk around an unseen, compact companion. We also find a central, dense equatorial disk-like structure which may enable and/or enhance the formation of the accretion disk.
Barnbaum Cecilia
Knapp Gillan R.
Morris Marita
Sahai Raghvendra
Young Kenneth K.
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