The GMOS Lithium-rich Giant Survey in M22

Details The GMOS Lithium-rich Giant Survey in M22 The GMOS Lithium-rich Giant Survey in M22

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21923001m&link_type=abstract

American Astronomical Society, AAS Meeting #219, #230.01

Astronomy and Astrophysics

Astronomy

Scientific paper

Approximately 1-2% of field K-giants have lithium abundances in excess of their expected low, diluted abundance. These Li-rich giants represent a challenge for standard stellar evolution, and several possibilities have been suggested, including giant planet ingestion and lithium production following the first dredge-up. Globular clusters are ideal laboratories for investigation of the li-rich giant phenomenon given the large number of giant members and relatively simple stellar populations. However, owing to the low incident rate and difficulty of observation, there are only few Li-rich giants known in globular clusters. The GMOS instrument at Gemini is an ideal Li-rich giant survey machine. Using a novel instrument setup, the spectrograph is capable of obtaining moderate resolution (R 8500) spectra of nearly 300 targets per field in modest amounts of time. I will present the initial results of my experimental survey of nearly 600 giants in M22.

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