Special point on the mass radius diagram of hybrid stars
  An analytical study that explains the existence of a very small region on the mass radius diagram of hybrid stars where all of the lines representing the sequences of models with different constant values of the bag constant B intersect is presented. This circumstance is shown to be a consequence of the linear dependence of pressure on energy density in the quark cores of hybrid stars. 
A. V. Yudin, T. L. Razinkova, D. K. Nadyozhin, A. D. Dolgov
astro-ph.SR