Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...438l..87s&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 438, no. 2, p. L87-L90
Astronomy and Astrophysics
Astrophysics
22
Abundance, Big Bang Cosmology, Cosmochemistry, Dwarf Stars, Globular Clusters, Lithium, Particle Diffusion, Stellar Evolution, Color-Magnitude Diagram, Halos, Losses, Stellar Mass, Stellar Models, Temperature Dependence
Scientific paper
It has been recognized for a decade that stellar models which account for the microscopic diffusion of lithium are not compatible with the nearly uniform lithium abundance, as a function of temperature, found in metal-poor halo dwarfs (the Spite plateau). The recent observations of Thorburn (1994) extend the Spite plateau by about 200 degrees (to higher temperatures) and thus significantly exacerbate the problem. Herein it is shown that microscopic diffusion can be compatible with the lithium observations if mild main-sequence mass loss occurs throughout the evolution of these halo dwarfs. Mass-loss rates of approximately -1 x 10-12 solar mass/yr are required. These models suggest that halo stars have depleted their initial lithium uniformly by a factor of approximately 1.6 or 0.2 dex. These models should also provide agreement with gobular cluster color-magnitude diagrams superior to that of diffusion models without mass loss.
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