AAS 207th Meeting, 8-12 January 2006
Session 71 (WIYN) Open Clusters and Associations
Poster, Tuesday, 9:20am-6:30pm, January 10, 2006, Exhibit Hall

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[71.07] WIYN Open Cluster Study: Lithium in the Hyades-Aged NGC 2539

J. D. Cummings, K.V. Croxall, C. P. Deliyannis (Indiana U.), A. Steinhauer (SUNY Geneseo), S.J. Margheim (Gemini South)

WIYN/Hydra high resolution (R=20,000) spectra of the lithium (6708 A) region are used to study the surface lithium depletion for 169 late A, F, G, and early K stars that are photometric members of NGC 2539. Additionally, radial velocity measurements from our data show that a vast majority of these stars are also radial velocity members. NGC 2539 is a Hyades-aged cluster (~ 650-700 Myr) with a WOCS photometric work in progress showing an [Fe/H] of ~ -0.23 (we will also determine a spectroscopic metallicity in this study); this makes it an interesting comparison cluster for the Hyades ([Fe/H] ~ +0.15), since it allows us to examine the predicted metallicity dependence of G-dwarf lithium depletion at a given age. Our results do agree with the prediction that the G-dwarfs in the more metal rich Hyades have a greater lithium depletion. We also compare the lithium abundance of the F-dwarf lithium gap, the late F/early G-dwarf lithium plateau, and the hotter and cooler stars. This work is supported by the National Science Foundation through grant AST-0206202.

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