2 ms·
See also "dredge-up". https://en.wikipedia.org/wiki/Dredge-up https://en.wikipedia.org/wiki/Dredge-up "By definition, during a dredge-up, a convection zone ex
by pfdietz 11mo ago
See also "dredge-up".
https://en.wikipedia.org/wiki/Dredge-up https://en.wikipedia.org/wiki/Dredge-up
"By definition, during a dredge-up, a convection zone extends all the way from the star's surface down to the layers of material that have undergone fusion."
- MattPalmer1086 11mo agoThat seems to cover elements up to carbon. Not sure heavier elements would be convected?
- pfdietz 11mo ago"The third dredge-up brings helium, carbon, and the s-process products to the surface," (emphasis added) In the early universe, stars had so little in the way of "seeds" for the s-process to act on that the few seeds that were there absorbed large numbers of neutrons, eventually producing weird stars highly enriched in lead (the end point of the s-process). These stars have been detected from lead (and bismuth) in their spectra. https://en.wikipedia.org/wiki/Lead_star https://en.wikipedia.org/wiki/Lead_star