Lithium abundances, K line emission and ages of nearby solar type stars

Abstract

view Abstract Citations (261) References (80) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Lithium abundances, K line emission and ages of nearby solar type stars. Duncan, D. K. Abstract It is shown that values of log n(Li) decline smoothly with time as well as spectral type for most F7-G5 dwarfs and subgiants, consistent with a process of convective overshoot that mixes Li-rich material from the bottom of the convection zone to regions hot enough for it to be destroyed by nuclear reactions. The Li deficiency of many F5 and F6 stars must, however, be caused by another mechanism, such as microscopic diffusion or turbulent mixing. In addition to measuring Li abundances and chromospheric emission fluxes in the core of the Ca II K line for over 100 field F5-G5 dwarfs and subgiants, consistent time scales for Li depletion are fitted to Pleiades, Ursa Major cluster, Hyades and solar data, and are applied to the field stars. The resulting age distribution indicates a slightly decreasing rate of star formation during the past 4-5 x 10 to the 9th years. Publication: The Astrophysical Journal Pub Date: September 1981 DOI: 10.1086/159190 Bibcode: 1981ApJ...248..651D Keywords: Abundance; K Lines; Lithium; Metallic Stars; Stellar Evolution; Stellar Spectra; Calcium; Emission Spectra; Hertzsprung-Russell Diagram; Pleiades Cluster; Stellar Atmospheres; Stellar Gravitation; Sun; Astrophysics full text sources ADS | data products SIMBAD (117)