2000/02/17 by S. Vauclair, Sylvie Vauclair, Vauclair, Sylvie
Physics and Astronomy · #Astro and Planetary Science #Astrophysics (astro-ph) #FOS: Physical sciences #Solar and Space Plasma Dynamics #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0002351
to appear in "The Light Elements and their Evolution", ASP conf. Series
arxiv created 2000/02/17 · openalex publication_date 2000/02/17 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The observations of light elements in the Sun and Solar type stars give\nspecial clues for understanding the hydrodynamical processes at work in stellar\ninteriors. In the Sun 7Li is depleted by 140 while 3He has not increased by\nmore than 10% in 3 Gyrs. Meanwhile the inversion of helioseismic modes lead to\na precision on the sound velocity of about .1%. The mixing processes below the\nsolar convection zone are constrained by these observations. Lithium is\ndepleted in most Pop I solar type stars. In halo stars however, the lithium\nabundance seems constant in the "spite plateau" with no observed dispersion,\nwhich is difficult to reconcile with the theory of diffusion processes. In the\npresent paper, the various relevant observations will be discussed. It will be\nshown that the mu-gradients induced by element settling may help solving the\n"lithium paradox".\n