A Firm Upper Limit to the Radius of the Neutron Star in SAX J1808.4−3658 | Zendy

L. Burderi | Zendy; A. R. King | Zendy

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A Firm Upper Limit to the Radius of the Neutron Star in SAX J1808.4−3658

Author(s) -

L. Burderi,

A. R. King

Publication year - 1998

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/311611

Subject(s) - neutron star , radius , limit (mathematics) , physics , star (game theory) , astrophysics , neutron , equation of state , nuclear physics , mathematical analysis , mathematics , quantum mechanics , computer science , computer security

We show that observations of X-ray pulsing from SAX J1808.4-3658 place a firmupper limit of 13.8 m^{1/3} km on the radius of the neutron star, where m isits mass in solar units. The limit is independent of distance or assumptionsabout the magnetospheric geometry, and could be significantly tightened byobservations of the pulsations in the near future. We discuss the implicationsfor the equation of state and the possible neutron star mass.

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