Publisher： Edp Sciences
E-ISSN： 1638-1963|26|issue|17-23
ISSN： 1633-4760
Source： EAS Publications Series, Vol.26, Iss.issue, 2007-06, pp. : 17-23
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Abstract
Gravitational settling and microscopic diffusion affects the mainsequence lifetimes, main sequence turn-off luminosities andtemperatures of metal-poor halo stars. As a result, the inclusion ofdiffusion in the stellar evolution models has important consequencesfor age determinations of old stars. In contrast, diffusion haslittle impact on the post-main sequence evolution of metal-poor stars.Observations of the heavy element abundances in turn-off and giantbranch stars in the globular cluster NGC 6397 suggest that diffusionoccurs in metal-poor stars, but that the diffusion must be inhibitedby turbulent mixing.
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