Long gamma-ray burst progenitors: boundary conditions and binary models

  title={Long gamma-ray burst progenitors: boundary conditions and binary models},
  author={E.P.J. van den Heuvel and S.-C. Yoon},
  journal={Astrophysics and Space Science},
Abstract The observed association of Long Gamma-Ray Bursts (LGRBs) with peculiar Type Ic supernovae gives support to Woosley‘s collapsar/hypernova model, in which the GRB is produced by the collapse of the rapidly rotating core of a massive star to a black hole. The association of LGRBs with small star-forming galaxies suggests low-metallicity to be a condition for a massive star to evolve to the collapsar stage. Both completely-mixed single star models and binary star models are possible. In… 

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