Abstract
Relativistic mean-field theory with parameter set FSUGold that includes the isoscalar-isovector cross interaction term is extended to study the properties of neutron star matter in $\ensuremath{\beta}$ equilibrium by including hyperons. The influence of the attractive and repulsive $\ensuremath{\Sigma}$ potential on the properties of neutron star matter and the maximum mass of neutron stars is examined. We also investigate the equations of state for pure neutron matter and for nonstrange hadronic matter for comparison. For a pure neutron star, the maximum mass is about 1.8${M}_{\text{sun}}$, while for a strange (nonstrange) hadronic star in $\ensuremath{\beta}$ equilibrium, the maximum mass is around 1.35${M}_{\text{sun}}$ (1.7${M}_{\text{sun}}$).
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