Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...445l.129b&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 445, no. 2, p. L129-L132
Astronomy and Astrophysics
Astronomy
54
Black Holes (Astronomy), Degenerate Matter, Neutron Stars, Nickel, Stellar Cores, Stellar Mass, Supernova Remnants, Supernova 1987A, Cobalt Isotopes, Gamma Ray Astronomy, Gamma Ray Observatory, Gamma Rays
Scientific paper
We review estimates of the mass of the compact core in SN 1987A and conclude that the most accurate determination can be obtained from the known value of approximately 0.075 solar mass of Ni production in the explosion. With binding energy correction, this gives an upper limit of gravitational mass of approximately 1.56 solar mass, slightly larger than Brown & Bethe's previous estimate of approximately 1.5 solar mass. Observation by Observing System Simulation Experiment (OSSE) of the ratio of gamma-rays from Co-57 and Co-56 indicates that neutron-rich material from the inner regions does not reach the mass cut by convection of Rayleigh-Taylor instability. Arguments that the core of SN 1987A went into a black hole are reviewed. If one accepts this to be true, then the maximum compact core mass gives an upper limit on neutron star masses of (MNS)max approximately equals 1.56 solar mass (gravitational), in rough agreement with the previous result of Brown & Bethe.
Bethe Hans A.
Brown Gerald E.
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