Lithium and rotation in the Hyades F dwarfs.

摘要: Data on Li/H abundances have been assembled for 32 Hyades F dwarfs from high signal-to-noise, high-spectral-resolution observations the coude spectrographs at CFH and Hale telescopes. The middle stars show a regular pattern in Li-temperature profile, particular narrow well-defined region with large Li deficiencies as first reported by Boesgaard Tripicco (1986). This profile is compared rotation-temperature based v sin i data Kraft. A relationship between abundance may be present dip. It possible that decreasing stellar rotation (with surface temperature mass) helps to slow down circulation of atoms depths where they would destroyed nuclear reactions. rise cool side dip result part slower rotation, spite deepening convection zone. minimum occurs T about 6650 K, which coincides both sharp decrease transition activity controlled dynamo.