Asteroseismic masses for 43 carbon-deficient giants show they are mostly low-mass helium-burning stars, and their chemistry points to core-flash mixing and hierarchical-triple mergers rather than AGB pollution.
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Asteroseismology of Carbon-Deficient Red Giants: Merger Products of Hierarchical Triple Systems?
Asteroseismic masses for 43 carbon-deficient giants show they are mostly low-mass helium-burning stars, and their chemistry points to core-flash mixing and hierarchical-triple mergers rather than AGB pollution.