Impacts of the Direct Urca and Superfluidity inside a Neutron Star on Type I X-Ray Bursts and X-Ray Superbursts

We investigate the impacts of neutrino cooling mechanism inside neutron star (NS) core on light curves type-I X-ray bursts and superbursts. From several observations NS thermal evolution, physical processes fast cooling, such as direct Urca (DU) process, are indicated. They significantly decrease surface temperature NSs, though effect could be suppressed by nucleon superfluidity. In present study, focusing DU process superfluidity, we effects using a general-relativistic stellar-evolution code. find that leads longer recurrence time higher peak luminosity, which obstructed neutrons also apply our burst models to comparison with {\it Clocked burster} GS 1826$-$24, superburst triggered carbon ignition. These significant within certain range binary parameters uncertainty equation state.