Equilibrium configurations for quark-diquark stars and the problem of Her X-1 mass

Details Equilibrium configurations for quark-diquark stars and the problem of Her X-1 mass Equilibrium configurations for quark-diquark stars and the problem of Her X-1 mass

1996-11-20

arxiv.org/abs/astro-ph/9611167v1

Int.J.Mod.Phys. D7 (1998) 19-28

Astronomy and Astrophysics

Astrophysics

15 pp., PlainTex file + 3 figures available upon request at foton@andromeda.iagusp.usp.br. Submitted to Int. Jour. Mod. Phys.D

Scientific paper

10.1142/S0218271898000036

We report new calculations of the physical properties of a quark-diquark plasma. A vacuum contribution is taken into account and is responsible for the appearance of a stable state at zero pressure and at a baryon density of about 2.2 times the nuclear matter density in this model. The resulting equation of state was used to integrate numerically the Tolman-Oppenheimer-Volkoff equations. The mass-radius relationship has been derived from a series of equilibrium configurations constituted by a mixture of quarks and diquarks. These stellar models, which are representative of a whole class, may be helpful to understand the possible compactness of the X-ray source Her X-1 and related objects.

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