Abstract
I describe how recent observations of metal‐poor stars made with large telescopes have lead to new insights into the evolution of metal‐poor stars. High dispersion [Fe/H] studies of sub‐giant and main sequence turn‐off stars in globular clusters have demonstrated that diffusion is inhibited in the envelope of metal‐poor stars. This is a puzzling result, as helioseismology provides strong evidence that envelope diffusion occurs in the Sun. Observations of detached double‐lined eclipsing binaries allow one to determine the mass and radius of the stars and hence, provide a critical test of stellar evolution models. Observations of detached double‐lined eclipsing binaries which are in the main sequence turn‐off region of the globular cluster Omega Cen are compared to theoretical stellar evolution models.
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