Turbulent transport and lithium destruction in main sequence stars

Details Turbulent transport and lithium destruction in main sequence stars Turbulent transport and lithium destruction in main sequence stars

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....56..211s&link_type=abstract

Astronomy and Astrophysics, vol. 56, no. 1-2, Apr. 1977, p. 211-218.

Astronomy and Astrophysics

Astrophysics

80

Astrophysics, Lithium, Main Sequence Stars, Stellar Models, Sun, Turbulent Diffusion, Angular Momentum, Distribution Functions, Flow Stability, Giant Stars, Shear Flow, Transport Properties

Scientific paper

A phenomenological relation between turbulent diffusion coefficient and turbulent viscosity in stars is derived. The destruction of lithium in main-sequence stars is examined in terms of turbulent transport to a level where the nuclear lifetime of the element is less than the star's lifetime, and lithium depletion during a star's main-sequence lifetime is estimated. This approach is applied to study the depletion of solar lithium in the framework of two models, one where only turbulent diffusion is taken into account and another where competition between gravitational drag and turbulent diffusion is considered. An attempt is made to verify whether the derived phenomenological relation is compatible with the apparent loss of angular momentum experienced by the sun. A distribution function for the initial equatorial angular velocity of main-sequence stars is obtained which indicates that the distribution of angular velocity within a star adjusts itself by turbulent transport in such a way that the star is locally always at the edge of shear flow instability.

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