Lithium in giant stars in NGC 752 and M67

Details Lithium in giant stars in NGC 752 and M67 Lithium in giant stars in NGC 752 and M67

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pasp..100..474p&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 100, April 1988, p. 474-480.

Astronomy and Astrophysics

Astronomy

31

Giant Stars, Lithium, Open Clusters, Stellar Composition, Abundance, Star Clusters

Scientific paper

Spectra of giant stars in the intermediate-age galactic cluster NGC 752 and in the old cluster M67 have been examined for the presence of Li I λ6707. The lithium feature is not present in any of the M67 giants observed, leading to upper-limit abundances of log ɛ(Li) ≤ -1.0 to 0.3. While lithium is not present in most NGC 752 giants, the feature is strong in two giants, Heinemann 77 and 208, log ɛ(Li) = +1.1 and +1.4, respectively. In the remaining giants in NGC 752, log ɛ(Li) < 0.5. The absence of lithium in M67 giants may be because these giants evolve from progenitors in the region of the main-sequence lithium dip.

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