Physics – Nuclear Physics
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989stin...9018347g&link_type=abstract
Presented at the International Workshop on Relativistic Aspects of Nuclear Physics, Rio de Janeiro, Brazil, 28-31 Aug. 1989
Physics
Nuclear Physics
Equations Of State, Pulsars, Supernova Remnants, Supernova 1987A, Astronomical Models, Extraterrestrial Matter, Quark Models
Scientific paper
The implications were investigated of the rapid rotation corresponding to the frequency of the new pulsar reported in the supernovae remnant SN1987A. It places very stringent conditions on the equation of state if the star is assumed to be bound by gravity alone. It was found that the central energy density of the star must be greater than 13 times that of nuclear density to be stable against the most optimistic estimate of general relativistic instabilities. This is too high for the matter to consist of individual hadrons. It is concluded that it is implausible that the newly discovered pulsar, if its half millisecond signals are attributable to rotation, is a neutron star. It is shown that it can be a strange quark star, and that the entire family of strange stars can sustain high rotation if strange matter is stable at an energy density exceeding about 5.4 times that of nuclear matter. The conversion of a neutron star to strange star is discussed along with the possible existence of a crust of heavy ions held in suspension by centrifugal and electric forces, the cooling and other features.
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