Lithium depletion and rotation in main-sequence stars

摘要: Lithium abundances were measured in nearly 200 old disk-population F stars to examine the effects of rotational braking on depletion Li. The sample was selected be slightly evolved off main sequence so that have completed all Li they will undergo sequence. A large scatter late is found, indicating not related age and spectral type alone. Conventional mechanisms like convective overshoot microscopic diffusion are unable explain with thin envelopes doubly taxed such a scatter. No correlation found between abundance present projected velocity some most rapid rotators undepleted, ruling out meridional circulation as cause depletion. There somewhat larger spread spun-down compared early which should remain rotationally unaltered 85 refs.