Constraints on the equation of state for neutron stars implied by PSR1957+20

Details Constraints on the equation of state for neutron stars implied by PSR1957+20 Constraints on the equation of state for neutron stars implied by PSR1957+20

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988natur.336..560f&link_type=abstract

Nature (ISSN 0028-0836), vol. 336, Dec. 8, 1988, p. 560-562. Research supported by NSF.

Physics

Condensed Matter

21

Equations Of State, Neutron Stars, Pulsars, Stellar Rotation, Condensed Matter Physics, Radio Frequencies, Stellar Evolution

Scientific paper

The periods of the two fastest known pulsars, PSR1937+214 and the recently discovered PSR1957+20, are within three percent of each other and are shorter than the period of any other known pulsars by about a factor of two. This observation substantially strengthens the argument that the fastest pulsars should rotate at the limiting frequency for stable neutron stars. It is shown here that if the two fastest pulsars are rotating at or near their limiting frequencies, and if their masses are at least 12.4 solar, then the equation of state of neutron star matter must be quite stiff.

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