Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..412..207h&link_type=abstract
The Biggest, Baddest, Coolest Stars ASP Conference Series, Vol. 412, proceedings of the workshop held 16-18 July 2007, at the Mi
Astronomy and Astrophysics
Astronomy
1
Scientific paper
Proto-planetary nebulae (PPNs) are objects in transition between the asymptotic giant branch (AGB; star is ``biggest and coolest'') and the planetary nebula (PN; star is ``smallest and hottest'') stages in the evolution of intermediate- and low-mass stars. As such, they possess some of the properties of each of these stages. The central stars of PPNs reveal AGB nucleosynthesis and continue to pulsate. The nebular shapes of PPNs are similar to those of PNs and they show some similar nebular chemistry. However, there are distinct differences that arise during this short-lived transitional phase (10^3 yr) which make the study of PPNs important in its own right. The properties of PPNs are reviewed, with emphasis on the author's own research.
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