Discovery of Super-Lithium Rich Red Giants in Milky Way Satellite Galaxies

Details Discovery of Super-Lithium Rich Red Giants in Milky Way Satellite Galaxies Discovery of Super-Lithium Rich Red Giants in Milky Way Satellite Galaxies

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21923006k&link_type=abstract

American Astronomical Society, AAS Meeting #219, #230.06

Astronomy and Astrophysics

Astronomy

Scientific paper

The convective envelopes of evolved red giants reach temperatures of millions of K, hot enough to destroy lithium. Very few red giants more luminous than the luminosity function bump display any detectable lithium. Nonetheless, we found 13 lithium-rich red giants among a sample of 2961 red giants in Milky Way dwarf satellite galaxies. The abundances range from A(Li) = 2.15 to 4.27. Nine of the stars have lithium abundances higher than the primordial value. Therefore, the lithium in these stars must have been created rather than saved from destruction. The ages of most of these galaxies suggest that the lithium was produced in the red giants themselves rather than mass transfer from intermediate-mass asymptotic giant branch stars.

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