Searching for Lithium in Globular Cluster Giants

Details Searching for Lithium in Globular Cluster Giants Searching for Lithium in Globular Cluster Giants

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...196.4104p&link_type=abstract

American Astronomical Society, 196th AAS Meeting, #41.04; Bulletin of the American Astronomical Society, Vol. 32, p.740

Astronomy and Astrophysics

Astronomy

Scientific paper

The discovery of a lithium-rich giant in the globular cluster M3 (IV-101; Kraft et al. 1999, \apjl, 518, L53) prompted a search for similar stars in a large sample of cluster giants in M3, M13, M15, and M92. A survey of 261 additional giants, carried out with the Hydra Multi-object Spectrograph on the 3.5-m WIYN Telescope, identified no stars with Li I 6707 Angstroms resonance lines stronger than 20 m Angstroms . The limiting equivalent widths of the lithium line provide upper limits of log ɛ (Li)<+0.0 at Teff=4500K and log ɛ (Li)<+1.0 at Teff=5000K. The absence of lithium-rich stars in the sample suggests that the percentage of giants exhibiting enhanced lithium abundances in globular clusters is low.

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