Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009iaus..258..383d&link_type=abstract
The Ages of Stars, Proceedings of the International Astronomical Union, IAU Symposium, Volume 258, p. 383-394
Astronomy and Astrophysics
Astronomy
Convection, Turbulence, Stars: Abundances, Stars: Evolution, Stars: Late-Type, Stars: Low-Mass, Stars: Oscillations
Scientific paper
A brief summary of the history of stellar evolution theory and the use of isochrones is given. The present state of the subject is summarized. The major uncertainties in isochrone construction are considered: chemical abundances and color calibrations, and the treatment of turbulent convection in stellar interior and atmosphere models. The treatment of convection affects the modeling of stellar interiors principally in two ways: convective core overshoot which increases evolutionary lifetimes, and the depth of convection zones which determines theoretical radii. Turbulence also modifies atmospheric structure and dynamics, and the derivation of stellar abundances. The symbiosis of seismic techniques with increasingly more realistic three-dimensional radiation hydrodynamics simulations is transforming the study of late-type stars. The important case of very low mass stars, which are fully convective, is briefly visited.
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