  The nucleon effective mass, binding energy and neutron star configuration in
the Relativistic Mean-Field Theory (RMF) is considered. The calculation are
motivated by the construction of the equation of state for a neutron star in
the RMF. The equation of state for the parameters set TM1 is calculated using
the Feynman - Bogolubov variational method for temperature different from zero.
The structure of the neutron star is presented. The maximal stable
configuration are obtained for: M_max=1.91 M_Sun and R=12.84 km.
