English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The rotational influence on the eddy-diffusivity tensor D_ij for anisotropicturbulence fields is considered in order to explain the lithium decay lawduring the spin-down process of solar-type stars. Rotation proves to be highlyeffective in the transfer of chemicals through the solar tachocline (beneaththe convection zone) which is assumed to contain only turbulence withhorizontal motions. The effect is so strong that the tachocline turbulence mustnot exceed a limit of ~10^-(3...4) of the rms velocity in the convection zonein order to let the lithium survive after Gigayears. Such long depletion timescan also be explained by a very small rotational influence upon theeddy-diffusion tensor if it is realized with correlation times shorter than 15min. It is argued that such slow and/or short-living turbulence beneath theconvection zone could hardly drive the solar dynamo. In our theory thediffusion remains small for rapid rotation due to the rotational quenching ofthe turbulence. In young stellar clusters like Pleiades, there should be a(positive) correlation between rotation rate and lithium abundance, where thefastest stars should have maximal lithium. First inspections of the data seemto confirm this finding.Comment: 6 pages, 9 figures, aa.cl

Lithium as a passive tracer probing the rotating solar tachocline turbulence