Li, X. D.Bombaci, I.Dey, MiraDey, Jishnu [UNESP]Van den Heuvel, E. P J2014-05-272014-05-271999-11-08Physical Review Letters, v. 83, n. 19, p. 3776-3779, 1999.0031-9007http://hdl.handle.net/11449/130555The 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.3776-3779engArtigo10.1103/PhysRevLett.83.3776WOS:000083546200008Acesso restrito2-s2.0-18344411261