Evolution and nucleosynthesis in Population III stars

Physics

Scientific paper

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Nuclear Fusion, Protostars, Stellar Evolution, Stellar Mass, Dwarf Stars, Electron Scattering, Electron-Positron Pairs, Hydrostatics, Main Sequence Stars, Pair Production, Particle Mass, Particle Tracks, Stellar Mass Ejection, Stellar Structure

Scientific paper

The evolution of very massive objects (VMOs) is discussed, presenting calculative results for nucleosynthesis in VMOs which have no metals and exist initially in the mass range of 80 to 500 solar masses. The equations of stellar structure for high mass stars were solved together with an equation of state which includes the effect of e(-)e(+) pair creation, electron scattering opacity, and expressions for nuclear energy generation in the various thermonuclear burning stages. Neutrino losses and mass loss were taken into account. Evolutionary tracks for stars of initial masses 80, 100, 150, 300, and 500 solar masses are shown, and the turns in the tracks are interpreted. Detailed evolutionary and parametric data are shown. The dynamical evolution of a 116 solar mass core originating from a 200 solar mass primordial VMO by quasistatic evolution with mass loss is described, showing the final, homologously proceeding explosion. The distribution of the various nuclear species as function of fractional mass in the exploded and processed stellar material is displayed.

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