During the late stages of their evolution, they provide the primary environment for the s-process. They show absorption features from titanium oxide a
During the late stages of their evolution, they provide the primary environment for the s-process. They show absorption features from titanium oxide and technetium, implying convective mixing in a dredge-up phase associated with their thermal pulses. They are initially supported by hydrogen shell burning before evolving onto the horizontal branch following the helium flash. The final thermal pulse of one of these objects can blow off a planetary nebula and leave a remnant white dwarf, a fate that is thought to await the Sun. FTP, name this post-main-sequence phase of evolution which sees low and medium-mass stars puff up to large sizes and cool off, producing the namesake color.
During the late stages of their evolution, they provide the primary environment for the s-process.
red giants [accept Asymptotic Giant Branch stars until "hydrogen shell burning"]