EAS Publications Series
Volume 26, 2007Stellar Evolution and Seismic Tools for Asteroseismology - Diffusive Processes in Stars and Seismic Analysis
|Page(s)||17 - 23|
|Published online||20 June 2007|
C.W. Straka, Y. Lebreton and M.J.P.F.G. Monteiro (eds)
EAS Publications Series, 26 (2007) 17-23
Effects of Microscopic Diffusion on the Evolution of Metal-Poor Stars
Department of Physics and Astronomy,
Dartmouth College, 6127 Wilder Lab, Hanover, NH 03755, USA
Gravitational settling and microscopic diffusion affects the main sequence lifetimes, main sequence turn-off luminosities and temperatures of metal-poor halo stars. As a result, the inclusion of diffusion in the stellar evolution models has important consequences for age determinations of old stars. In contrast, diffusion has little impact on the post-main sequence evolution of metal-poor stars. Observations of the heavy element abundances in turn-off and giant branch stars in the globular cluster NGC 6397 suggest that diffusion occurs in metal-poor stars, but that the diffusion must be inhibited by turbulent mixing.
© EAS, EDP Sciences, 2007
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