Turbulence and the Li abundance in main sequence and giant stars

Journal Article · Sun Apr 01 04:00:00 EDT 1990 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/168570· OSTI ID:6806969

Charbonneau, P; Michaud, G ^[1]

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1. Montreal Universite, Montreal (Canada)

Calculations of Li burning via turbulent transport are conducted to determine the extent to which observed Li abundances in first ascent giants constrain the various turbulence parameterizations used to model the main-sequence surface Li abundance evolution. A full time-dependent solution to the transport equation is performed, including nuclear reaction terms and evolutionary effects. It is found that turbulence can lead to the extreme Li underabundances observed in giants of M67 and NGC 752. Consideration is given to the possibility of using observations of Li abundances to discriminate between turbulent particle transport and meridional circulation transport. Numerical solutions of the turbulent diffusion coefficient of Vauclair (1988) is used to model the Hyades Li abundance gap. The astrophysical implications of the results for main-sequence and giant stars are discussed. 36 refs.

• OSTI ID: 6806969
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 352; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
ALKALI METALS
CHEMICAL COMPOSITION
ELEMENT ABUNDANCE
ELEMENTS
GIANT STARS
LITHIUM
MAIN SEQUENCE STARS
METALS
NUMERICAL SOLUTION
STAR BURNING
STAR EVOLUTION
STARS
TIME DEPENDENCE
TRANSPORT THEORY
TURBULENCE