S-Sterne sind Übergangssterne am oberen Ende des AGB zwischen M- und C-Sternen.
Der dritte "dredge-up" in thermisch pulsenden AGB-Sternen treibt neu entstandenen Kohlenstoff aus der He-brennenden Schale in die Sternatmosphäre.
www.ita.uni-heidelberg.deS-stars are transition objects at the top of the AGB between M- and C-stars.
The third dredge-up in thermally pulsating AGB-stars transports newly synthesized carbon from the He burning zone into the stellar atmosphere.
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