Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011hsa6.conf..430s&link_type=abstract
Highlights of Spanish Astrophysics VI, Proceedings of the IX Scientific Meeting of the Spanish Astronomical Society (SEA), held
Astronomy and Astrophysics
Astrophysics
Scientific paper
The processes that lead to the formation of Planetary Nebula (PN), through the short intermediate stage of pre-PN, are complex and poorly known. The biggest challenge in the study of PN formation is understanding the origin of the remarkable morphological and kinematical differences between the circumstellar envelopes (CSEs) around Asymptotic Giant Branch (AGB) stars, which result from the star mass-loss process during the AGB, and their more evolved counterparts, PPNe and PNe. While AGB CSEs expand isotropically at low velocity (about 5-15 km/s), most PPNe and PNe have clear departures from sphericity and show fast (>100 km/s) bipolar or multipolar outflows. This spectacular metamorphosis is believed to be governed by the interaction between fast, collimated post-AGB winds (or jets), and the slow AGB CSE. In this presentation, I will review these late stages of the evolution of solar type stars and will describe some common observational techniques used to characterize the different nebular components in these objects.
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