WIYN Open Cluster Study: Lithium in the Young and Metal-Poor Cluster M36

Details WIYN Open Cluster Study: Lithium in the Young and Metal-Poor Cluster M36 WIYN Open Cluster Study: Lithium in the Young and Metal-Poor Cluster M36

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20916510c&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #165.10; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

We present Li abundances in 154 late A, F, G, K, and early M dwarfs that are photometric candidate members of M36 (NGC 1960), derived from high resolution (R 13,000) spectra obtained with the Hydra multi-fiber spectrograph on the WIYN 3.5m telescope. Radial velocity measurements from our data show that a majority of these stars are also radial velocity members. M36 is a young ( 40 Myr) and metal-poor ([Fe/H] -0.3) open cluster; this makes it an interesting comparison cluster for the young and near solar-metallicity ([Fe/H] = -0.034 +/0.024 [Boesgaard & Friel, 1990]) Pleiades cluster. The A, F, G, and early K dwarfs in M36 show a rather flat plateau with little Li dispersion, at a Li level that is marginally below that of the Pleiades Li plateau. We interpret this M36 Li plateau as reflecting the undepleted M36 initial cluster Li abundance, and its level is consistent with the hypothesis that Galactic Li production resulted in a higher level for the (undepleted) Pleiades Li plateau. We also find that: a) the coolest dwarf are depleted relative to the plateau level and b) they have nonetheless suffered significantly less Li depletion than Pleiades dwarfs of the same Teff. This supports the robust prediction, from standard stellar evolution theory, that pre-main sequence depletion of the surface Li abundance in K and M dwarfs depends on metallicity: higher metallicity should result in greater Li depletion. This work is supported by the National Science Foundation through grant AST-0206202.

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