The abundance of lithium in the old galactic cluster NGC 7789

Details The abundance of lithium in the old galactic cluster NGC 7789 The abundance of lithium in the old galactic cluster NGC 7789

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...282l..17p&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 282, July 1, 1984, p. L17-L21.

Astronomy and Astrophysics

Astrophysics

5

Galactic Clusters, Lithium, Metallicity, Red Giant Stars, Color-Magnitude Diagram, Spectral Resolution, Stellar Evolution, Stellar Spectra

Scientific paper

The 6707 A doublet of lithium is found to be unusually strong in several red giant stars in the old galactic cluster NGC 7789. In some stars, the lithium abundance is near the cosmic value. The presence of enhanced lithium in a cluster with a well-defined color-magnitude diagram provides specific information on the behavior of lithium in low-mass, evolved stars. At luminosities just above the core helium-burning clump, lithium is enhanced to almost the cosmic abundance. The lithium line strength declines along the upper giant branch, suggesting that lithium is rapidly depleted during this phase of stellar evolution.

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