Strong chromospheric He I 10830 and high lithium occur together mainly in younger red clump giants, pointing to the helium flash as a common origin.
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High Lithium Abundance Connection with the Chromospheric Helium in Red Giants: Spectroscopic and Asteroseismic analyses
Strong chromospheric He I 10830 and high lithium occur together mainly in younger red clump giants, pointing to the helium flash as a common origin.