SIMBAD references

2013ApJ...767L..19A - Astrophys. J., 767, L19 (2013/April-2)

A lithium-rich red giant below the clump in the Kepler cluster, NGC 6819.


Abstract (from CDS):

WIYN/HYDRA spectra in the Li 6708 Å region have been obtained for 332 probable members of the old open cluster, NGC 6819. Preliminary analysis shows a pattern of Li depletion from the top of the turnoff to the base of the giant branch. Starting 1 mag below the level of the clump, all brighter giants have A(Li) below 1.0, with most having upper limits below 0.5. Star W007017, located below the first-ascent red giant bump is Li-rich with A(Li) = 2.3. As a highly probable single-star astrometric and radial-velocity cluster member, its discrepant asteroseismic membership could be a by-product of the processes that triggered Li enhancement. Its color-magnitude diagram location is consistent with only one proposed enhanced mixing process among first-ascent red giants.

Abstract Copyright:

Journal keyword(s): open clusters and associations: individual: NGC 6819 - stars: abundances - stars: chemically peculiar

Simbad objects: 12

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