Neutron Stars with a Quark Core. II. Basic Integral and Structural Parameters

Authors: Alaverdyan G.B.¹; Harutyunyan A.R.²; Vartanyan Y.L.³

Source: Astrophysics, Volume 47, Number 1, January 2004 , pp. 52-64(13)

Publisher: Springer

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Abstract:

A broad sample of computed realistic equations of state of superdense matter with a quark phase transition is used to construct a series of models of neutron stars with a strange quark core. The integral characteristics of the stellar configurations are obtained: gravitational mass, rest mass, radius, relativistic moment of inertia, and red shift from the star’s surface, as well as the mass and radius of the quark core within the allowable range of values for the central pressure. The parameters of some of the characteristic configurations of the calculated series are also given and these are studied in detail. It is found that a new additional region of stability for neutron stars with strange quark cores may exist for some models of the equation of state.

Keywords: neutron stars; quark core

Document Type: Research article

DOI: http://dx.doi.org/10.1023/B:ASYS.0000017236.53514.29

Affiliations: 1: Yerevan State University, Armenia, Email: galaverdyan@ysu.am 2: Yerevan State University, Armenia, Email: anharutr@ysu.am 3: Yerevan State University, Armenia, Email: yuvartanyan@ysu.am

Publication date: 2004-01-01