Lithium and metallicity in the Ursa Major group

High-resolution (0.1 - 0.2 Å), high signal-to-noise (200 - 700) spectra have been taken of several F dwarfs in the UMa group with the coudé spectrographs of the CFH Telescope with a Reticon detector and the Palomar 5 m telescope with a TI CCD. The spectra are centered at 6700 Å and cover 135 Å or 110 Å. Abundances of both Li and Fe have been determined through a model atmosphere abundance analysis. The metal content of the UMa group is found to be [Fe/H] = -0.079±0.053. The relationship between Li and temperature for the UMa group resembles that of the Hyades for the F stars with a deep deficiency in Li in the middle-F stars. The "initial" Li/H for the UMa group is 1.2×10-9; meteorites, field F stars, visual binaries, other clusters, and T Tau stars show this value also. There is no evidence for significant Li enrichment in the Galactic disk since the time of the formation of the solar system.