The evolution of very luminous stars. II - Pair creation supernova in massive Wolf-Rayet stars

Details The evolution of very luminous stars. II - Pair creation supernova in massive Wolf-Rayet stars The evolution of very luminous stars. II - Pair creation supernova in massive Wolf-Rayet stars

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...167..274e&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 167, Oct. 1986, p. 274-281.

Astronomy and Astrophysics

Astrophysics

30

Cassiopeia A, Pair Production, Stellar Evolution, Stellar Luminosity, Supernovae, Wolf-Rayet Stars, Abundance, Electron-Positron Pairs, Hydrodynamics, Nuclear Fusion, Oxygen, Stellar Mass Ejection, Supernova Remnants

Scientific paper

The massive Wolf-Rayet stars of 45 and 61 solar masses previously obtained from the quasi-static calculations of a 100 solar masses Population I star with extreme assumptions about overshooting are evolved through the supernova stage. The present hydrodynamical calculations show that both WR stars encounter the electron-positron-pair creation instability which means that the 100 solar masses star becomes pair unstable independent of overshooting. Its final fate is found to be complete disruption by explosive oxygen burning. The abundances of the supernova ejecta are found to be compatible with the observed abundances in the supernova remnant Cas A. As a possible scenario for this object the explosion by the pair creation supernova of a Wolf-Rayet star of type WN and a mass of about 45 solar masses, which evolves from a star of an initial mass close to 100 solar masses, is proposed. The investigations seem not to be only restricted to Cas A, since the recent observations of the supernova 1985 f in NGC 4618 suggest that this object has resulted from an exploding Wolf-Rayet star of about 50 solar masses.

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