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1986 Fiscal Year Final Research Report Summary

Element synthesis in the late and explosive stages of stellar evolution

Research Project

Project/Area Number 60540152
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Astronomy
Research InstitutionUniversity of Tokyo

Principal Investigator

ERIGUCHI Yoshiharu  College of Arts and Sciences, University of Tokyo, 教養部, 助手 (80175231)

Co-Investigator(Kenkyū-buntansha) KATO Mariko  Department of Astronomy, Keio University, 理工学部, 講師 (50185873)
SAIO Hideyuki  Faculty of Science, University of Tokyo, 理学部, 助手 (10162174)
NOMOTO Ken'ichi  College of Arts and Sciences, University of Tokyo, 教養学部, 助教授 (90110676)
Project Period (FY) 1985 – 1986
KeywordsSupernova explosion / Element synthesis / Stellar evolution / White dwarf / Neutron star / Contact binary / 回転星
Research Abstract

1. We have developed a computer code which can handle the massive star evolution with detail nuclear network. By this code we computed evolution of 8M <of sun> -25M <of sun> stars. For 8M <of sun> and 3.3M <of sun> helium star the mass of the iron core is 1.6M <of sun> and 1.2M <of sun> , respectively. This small iron core (1.2M <of sun> ) has special importance because the shock wave generated during the collapse stage will be able to blow up the outer region in a few millisecond. For 10-11M <of sun> stars neon burning front propagates towards the center and an explosive neon flash will be expected.
2. The results from elementsynthesis of carbon burning white dwarf model for Type I supernova have been compared to the obseravtional data such as specrtum, light curve and X-ray emission. Their agreement is quite well. C+O white dwarf models as progenitor of Type I supernova have been studied. By assuming a spherical model we computed mass accretion and carbon burning When the accretion rate is greater than 2x <10^(-6)> M <of sun> <y^(-1)> , the carbon flash propagates towards the center and a neutron satr will be expected to form. We also studied non-spherical configurations. However the heavy disk formation is unlikely to occur and due to the garvitational radiation separation between two white dwarfs becomes small. Thus mass begins to flow out from the system and two white dwarfs begins to merge. But the maximum density reached is not high enough to trigger the supernova explosion.

  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] Hideyuki Saio: Astronomy and Astrophysics. 150. L21-L23 (1985)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Masaaki Hashimoto: Astrophysical Journal. 307. 687-693 (1986)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ken'ichi Nomoto: Astrophysics and Space Sciences. 118. 305-309 (1986)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ken'ichi Nomoto: Progress in Particle and Nuclear Physics. 17. 267-285 (1986)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yoshiharu Eriguchi: Astronomy and Astrophysics. 168. 130-138 (1986)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ken'ichi Nomoto: Astrophysical Journal. 312. 711-726 (1987)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hideyuki Saio: "Evolution of a Merging Pair of C+O White Dwarfs to Form a Single Neutron Star" Astronomy and Astrophysics. 150. L21-L23 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Masaaki Hashimoto: "The <^(14)N> ( <e^-> , <nu> ) <^(14)C> ( <alpha> , <gamma> ) <^(18)O> Reaction and Helium Flashes in Accreting Helium White Dwarfs" Astrophysical Journal. 307. 687-693 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ken'ichi Nomoto: "Carbon Degragration Models for Type I Supernova and Theoretical Optical Spectra" Astrophysics and Space Sciences. 118. 305-309 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ken'ichi Nomoto: "Late Stages of Massive Star Evolution and Nucleosynthesis" Progress in Particle and Nuclear Physics. 17. 267-285 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yoshiharu Eriguchi: "Meridional Flow of a Self-Gravitating Body I." Astronomy and Astrophysics. 168. 130-138 (1986)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1988-11-09  

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