  Strange stars calculated from a realistic equation of state (EOS), that
incorporate chiral symmetry restoration as well as deconfinement at high
density show compact objects in the mass radius curve. We compare our
calculations of incompressibility for this EOS with that of nuclear matter. One
of the nuclear matter EOS has a continuous transition to ud-matter at about
five times normal density. Another nuclear matter EOS incorporates density
dependent coupling constants. From a look at the consequent velocity of sound,
it is found that the transition to ud-matter seems necessary.
