Carbon burning in intermediate mass primordial stars

Abstract

The evolution of a zero metallicity 9 M_s star is computed, analyzed and compared with that of a solar metallicity star of identical ZAMS mass. Our computations range from the main sequence until the formation of a massive oxygen-neon white dwarf. Special attention has been payed to carbon burning in conditions of partial degeneracy as well as to the subsequent thermally pulsing Super-AGB phase. The latter develops in a fashion very similar to that of a solar metallicity 9 M_s star, as a consequence of the significant enrichment in metals of the stellar envelope that ensues due to the so-called third dredge-up episode. The abundances in mass of the main isotopes in the final ONe core resulting from the evolution are X(^{16}O) approx 0.59, X(^{20}Ne) approx 0.28 and X(^{24}Mg) approx 0.05. This core is surrounded by a 0.05 M_s buffer mainly composed of carbon and oxygen, and on top of it a He envelope of mass 10^{-4} M_s

11 pages, 11 figures, accepted for publication in A&A

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Cited by in corpus (15)

• Very low metallicity massive star models: Pre-SN evolution and primary nitrogen production
• Effects of rotation on the evolution of primordial stars
• The Origin of Carbon-Enhancement and Initial Mass Function of Extremely Metal-Poor Stars in the Galactic Halo
• Evolution of progenitors for electron capture supernovae
• Origin of Abundance Inhomogeneity in Globular Clusters
• On Carbon Burning in Super Asymptotic Giant Branch Stars
• The evolution of low-metallicity asymptotic giant branch stars and the formation of carbon-enhanced metal-poor stars
• Evolution of Low- and Intermediate-Mass Stars with [Fe/H] <= -2.5
• The formation of ultra-massive carbon-oxygen core white dwarfs and their evolutionary and pulsational properties
• The late stages of the evolution of intermediate-mass primordial stars: the effects of overshooting
• Evolution and CNO yields of Z=10^-5 stars and possible effects on CEMP production
• Structure and evolution of ultra-massive white dwarfs in general relativity
• Carbon-oxygen ultra-massive white dwarfs in general relativity
• Single and binary evolution of Population III stars and their supernovae light curves
• Nucleosynthetic yields of Z=$10^{-5}$ intermediate-mass stars