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  • SPACE SCIENCES  (2)
  • 1
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    Neutron-star formation in the carbon-detonation supernova. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Neutrino losses, such as those driven by the convective Urca process, may affect the evolution of stars in the mass range from 4 to 8 solar masses so as to lead to collapse of their degenerate carbon/oxygen cores. A corresponding hydrodynamic model is computed which leads to the formation of a 1.3 to 1.4 solar mass neutron star with the expulsion of a small fraction of the mass, about 0.l solar mass at about 20,000 km/sec into the overlying hydrogen envelope. This sets the stage for the Ostriker-Gunn mechanism in which Type II supernovae and pulsars are formed.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 184; Sept. 15
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Envelope dynamics of iron-core supernova models (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Wilson (1971) has found that the neutrino transport mechanism is unable to generate a supernova explosion in stars with collapsing iron cores. The present work uses Wilson's analysis to investigate the behavior of the overlying potentially explosive layers which Wilson omitted. The outer boundary of the core of Wilson's models moves in such a manner as to deliver a shock to the base of the envelope. We have numerically followed the progress of such shocks into the envelope of a realistic model obtained from evolutionary calculations. We find that only shocks so strong as to be inconsistent with our treatment are capable of ejecting material. For reasonable shocks the nuclear burning does not proceed rapidly at densities below 1,000 kg/cu cm, and the nuclear energy released is less than the shock energy in all models that come near to ejecting matter.
    Keywords: SPACE SCIENCES
    Type: Astrophysics and Space Science; 29; Aug. 197
    Format: text
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    NASA TECHNICAL REPORTS
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