Evolution of 8-10 solar mass stars toward electron capture supernovae. I - Formation of electron-degenerate O + NE + MG cores

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Abstract

view Abstract Citations (583) References (77) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Evolution of 8-10 solar mass stars toward electron capture supernovae. I - Formation of electron-degenerate O + NE + MG cores. Nomoto, K. Abstract One triggering mechanism suggested for supernovae involves the collapse of a degenerate core due to electron captures. Barkat et al. (1974) showed that an eight solar mass star develops a degenerate core after nonexplosive carbon burning. Miyaji et al. (1980) performed hydrodynamical calculations regarding a degenerate O + Ne + Mg core. It was found that electron captures on Mg-24 and Ne-20 trigger the collapse of the core prior to the initiation of explosive oxygen burning. In the present investigation the gravitational contraction of hypothetical pure neon stars is discussed in order to clarify the effect of electron degeneracy on neon ignition and stellar evolution, which is crucial for 8-10 solar mass stars. A summary is provided of the evolution from helium burning through the phase of the developing O + Ne + Mg core. Attention is given to neon ignition, the origin of hydrogen-deficient carbon stars, and the evolution toward supernova stages, and possible formation of white dwarfs. Publication: The Astrophysical Journal Pub Date: February 1984 DOI: 10.1086/161749 Bibcode: 1984ApJ...277..791N Keywords: Abundance; Electron Capture; Stellar Evolution; Stellar Structure; Supernovae; Carbon Stars; Gravitational Collapse; Magnesium; Milky Way Galaxy; Neon; Nuclear Fusion; Oxygen; White Dwarf Stars; Astrophysics full text sources ADS | Related Materials (1) Part 2: 1987ApJ...322..206N

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