WIYN Open Cluster Study: Signature(s) of Main Sequence Lithium Depletion Mechanism(s) from Subgiants of the Old (6-7Gyr) Open Cluster NGC 188

Details WIYN Open Cluster Study: Signature(s) of Main Sequence Lithium Depletion Mechanism(s) from Subgiants of the Old (6-7Gyr) Open Cluster NGC 188 WIYN Open Cluster Study: Signature(s) of Main Sequence Lithium Depletion Mechanism(s) from Subgiants of the Old (6-7Gyr) Open Cluster NGC 188

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20916508t&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #165.08; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

We present Li abundances in subgiants of the old (6-7Gyr) open cluster NGC 188, derived from high signal-to-noise, high resolution (R 15,000) spectra obtained with the Hydra multi-fiber spectrograph on the WIYN 3.5m telescope. These data multiply by a large factor the number of Li observations reported for this cluster. Membership and binarity were evaluated on photometric, proper motion, and radial velocity data. A variety of physical mechanisms have been proposed to explain the Li depletion that occurs in F dwarfs during the main sequence. Each mechanism leaves a distinct signature in the profile of the Li preservation region (abundance of Li vs. stellar depth). As surface convection zones deepen during subgiant evolution, they can reveal the signature(s) of the dominant main sequence Li depletion mechanism(s). Data from our previous work on the slightly younger (4-5 Gyr) M67 open cluster argued against models with diffusion and mass loss and in favor of models with rotationally induced (slow) mixing. Subgiants in NGC 188 have slightly lower mass than those in M67 (and come from a slightly cooler portion of the late F dwarf main sequence). Our conclusions from our NGC 188 data are compared and contrasted to those from our M67 data. See also our poster on NGC 188 dwarfs (Gill et al.) This work is supported by the National Science Foundation grant AST-04-52975 via the REU program at Indiana University.

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