Full convection limit for population 2 contact binaries

Astronomy and Astrophysics – Astronomy

Scientific paper

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Abundance, Binary Stars, Convection, Globular Clusters, Metallicity, Stellar Composition, Stellar Envelopes, Stellar Models, Stellar Orbits, Hydrogen, Iron, Stellar Color, Stellar Mass

Scientific paper

Limiting period-color relations for contact binaries of low metal abundance are given. The relations are based on the full convection limit for the more massive components and apply over the range (Fe/H) = -0.47 to (Fe/H) = -2.26. Recently obtained data for W UMa systems in globular clusters NGC 5466 and NGC 4372 are consistent with these limits.

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