Is SAX J1808.4-3658 a Strange Star?

X.-D. Li, I. Bombaci, Mira Dey, Jishnu Dey, and E. P. J. van den Heuvel
Phys. Rev. Lett. 83, 3776 – Published 8 November 1999
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Abstract

The possibility of strange stars is one of the most important issues in the study of compact objects. Here we use the observations of the newly discovered millisecond x-ray pulsar SAX J1808.4-3658 to constrain the radius of the compact star. Comparing the mass-radius relation of SAX J1808.4-3658 with theoretical models for both neutron stars and strange stars, we argue that a strange star model could be more consistent with SAX J1808.4-3658, and suggest that it is a likely strange star candidate. Our results are useful in constraining microscopic chiral symmetry restoration parameters in the quantum chromodynamics (QCD) modeling of strange matter.

  • Received 23 November 1998

DOI:https://doi.org/10.1103/PhysRevLett.83.3776

©1999 American Physical Society

Authors & Affiliations

X.-D. Li1, I. Bombaci2, Mira Dey3,*, Jishnu Dey4,5, and E. P. J. van den Heuvel6

  • 1Department of Astronomy, Nanjing University, Nanjing 210093, China
  • 2Dipartimento di Fisica, Universitá di Pisa and I.N.F.N. Sezione di Pisa, via Buonarroti 2, I-56127 Pisa, Italy
  • 3Department of Physics, Presidency College, Calcutta 700 073, India
  • 4IFT-UNESP, 145 Rua Pamplona, São Paulo 01405-900, Brazil
  • 5and Azad Physics Centre, Maulana Azad College, Calcutta 700 013, India
  • 6Astronomical Institute, University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands

  • *Also an associate member of the International Centre for Theoretical Physics, Trieste, Italy.

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Issue

Vol. 83, Iss. 19 — 8 November 1999

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