Quote:
Originally Posted by renormalised
No....rapid neutron capture, core collapse supernovae 
AGB's are a very specific stage in the evolution of giant stars. AGB stage is the second climb to gianthood for stars that occurs after the helium flash within the cores of the stars. It's also the stage where the stars reach maximum size and luminosity just before they become unstable and start to puff off their outer layers to become planetary nebs. This starts to occur once the stars build up enough carbon and oxygen ash in their cores to shutdown the nuclear reactions there. Then the helium burning moves out into a shell around the core, along with hydrogen burning as well.
It's the S process which occurs in AGB's. It's where you get elements like fluorine, chlorine, silicon etc, forming. Most of the heavier trans Fe elements forming in the S process are things like Te, Ce, Bi, Pb etc. |
Correct !!
A cut & paste error ...
As Bert says, "I always leave some rope lying around to jump up and lynch unwary onlookers with !"
(Pretty weak excuse to quote from others because of my mistake, huh ?).
Cheers