Lithium in the Pleiades and Alpha Persei clusters

The authors have made observations of the Li region in 23 F dwarfs of the Pleiades and α Per clusters. All 21 of the stars in the temperature region 6100 - 7300K show strong Li I lines with values of log N(Li) near 3.0 [where log N(H) = 12.0]. There is no apparent Li dip in the Pleiades Li-temperature profile, although a decrease to log N(Li) ≡ 2.85 near 6500K cannot be excluded. The dramatic decline in surface Li, possibly caused by diffusion or differential rotation, apparently occurs for cluster stars between the ages of ≡5×10⁷ and ≡5×10⁸yr. The authors have determined the [Fe/H] abundances for each of their Pleiades and α Per stars. The mean [Fe/H] for the Pleiades is 0.00±0.05 and for α Per is +0.01±0.07.