SIMBAD references

The Lithium Dip is a severe nonstandard depletion of surface Li in F dwarfs that occurs during the main sequence. We present Li and $v\sin i$ measurements from WIYN/Hydra and CTIO/Hydra spectra of four open clusters whose ages span the range between that of the Pleiades (∼100 Myr), which shows little if any depletion, and that of the Hyades (∼650 Myr), where the dip was first detected. Restricting this study to include only single members for all six clusters plus Praesepe and M48 and using refined membership data such as those from Gaia DR2 lead to the following conclusions. The development of the Li dip is clearly seen. Each cluster shows a correlation between Li and $v\sin i$ with little scatter. The slope of this correlation increases steadily with age, suggesting that the Li depletion and spin-down of these stars are related. This evolution of the lithium-rotation correlation suggests a new method for determining ages of Li-dip stars, which we explore.