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Lithium as a passive tracer probing the rotating solar tachocline turbulence

Lookup NU author(s): Dr G Rudiger

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Abstract

The rotational influence on the eddy-diffusivity tensor D-ij for anisotropic turbulence fields is considered in order to explain the lithium decay law during the spin-down process of solar-type stars. Rotation proves to be highly effective in the transfer of chemicals through the solar tachocline (beneath the convection zone) which is assumed to contain only turbulence with horizontal motions. The effect is so strong that the tachocline turbulence must not exceed a limit of similar to 10(-(3...4)) of the rms velocity in the convection zone in order to let the lithium survive after Gigayears. Such long depletion times can also be explained by a very small rotational influence upon the eddy-diffusion tensor if it is realized with correlation times shorter than 15 min. It is argued that such slow and/or short-living turbulence beneath the convection zone could hardly drive the solar dynamo. In our theory the diffusion remains small for rapid rotation due to the rotational quenching of the turbulence. In young stellar clusters like Pleiades, there should be a (positive) correlation between rotation rate and lithium abundance, where the fastest stars should have maximal lithium. First inspections of the data seem to confirm this finding.

Publication metadata

Author(s): Rudiger G, Pipin VV

Publication type: Article

Publication status: Published

Journal: Astronomy & Astrophysics

Year: 2001

Volume: 375

Issue: 1

Pages: 149-154

ISSN (print): 0004-6361

ISSN (electronic): 1432-0746

Publisher: EDP Sciences

URL: http://dx.doi.org/10.1051/0004-6361:20010849

DOI: 10.1051/0004-6361:20010849

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