Stellar Evolution at Low Metallicity

Abstract

Massive stars played a key role in the early evolution of the Universe. They formed with the first halos and started the re-ionisation. It is therefore very important to understand their evolution. In this review, we first recall the effect of metallicity (Z) on the evolution of massive stars. We then describe the strong impact of rotation induced mixing and mass loss at very low Z. The strong mixing leads to a significant production of primary nitrogen 14, carbon 13 and neon 22. Mass loss during the red supergiant stage allows the production of Wolf-Rayet stars, type Ib,c supernovae and possibly gamma-ray bursts (GRBs) down to almost Z=0 for stars more massive than 60 solar masses. Galactic chemical evolution models calculated with models of rotating stars better reproduce the early evolution of N/O, C/O and C12/C13. Finally, the impact of magnetic fields is discussed in the context of GRBs.

12 pages, 7 figures, "Massive Stars as Cosmic Engines" Conference proceedings (IAU Symp 250), F. Bresolin, P.A. Crowther, J. Puls Eds

References in corpus (24)

• How Massive Single Stars End their Life
• The Nucleosynthetic Signature of Population III
• The First Stars
• The Progenitor Stars of Gamma-Ray Bursts
• Presupernova Evolution of Differentially Rotating Massive Stars Including Magnetic Fields
• Pulsational pair instability as an explanation for the most luminous supernovae
• SN 2006gy: Discovery of the most luminous supernova ever recorded, powered by the death of an extremely massive star like Eta Carinae
• Presupernova Evolution of Rotating Massive Stars II: -- Evolution of the Surface Properties
• The Formation of the First Low-Mass Stars From Gas With Low Carbon and Oxygen Abundances
• Explosive yields of massive stars from Z=0 to Z=Zsun
• On the Initial Mass Function of Population III Stars
• Variations in the Abundance Pattern of Extremely Metal-poor Stars and Nucleosynthesis in Population III Supernovae
• Supernova Nucleosynthesis in Population III 13 -- 50 $M_{\odot }$ Stars and Abundance Patterns of Extremely Metal-Poor Stars
• Fragmentation of star-forming clouds enriched with the first dust
• Line-driven winds, ionizing fluxes and UV-spectra of hot stars at extremely low metallicity. I. Very massive O-stars
• The first chemical enrichment in the universe and the formation of hyper metal-poor stars
• Population III stars: hidden or disappeared ?
• Is HE0107-5240 A Primordial Star? -- The Characteristics of Extremely Metal-Poor Carbon-Rich Stars --
• The Detectability of Pair-Production Supernovae at z < 6
• Evolution and Yields of Extremely Metal Poor Intermediate Mass Stars
• Structure, Evolution and Nucleosynthesis of Primordial Stars
• On the origin of HE0107-5240, the most iron deficient star presently known
• The Oxygen Abundance of HE 1327-2326
• Evolution and nucleosynthesis of primordial low mass stars

Cited by in corpus (5)

• Effects of rotation on the evolution of primordial stars
• Convective H-He Interactions in Massive Population III Stellar Evolution Models
• Long-Duration Gamma-Ray Burst Host Galaxies in Emission and Absorption
• Evolution and CNO yields of Z=10^-5 stars and possible effects on CEMP production
• Stellar Evolution in the Early Universe