Description
Thermonuclear bursts are explosive flashes of X-rays caused byunstable nuclear burning of accreted material on the surface of aneutron star in a low-mass X-ray binary (LMXB). Observing coolingbehaviors of these bursts provide crucial insights into the nuclearburning processes on the surface of accreting neutron stars. In thisstudy, we analyze 39 different bursts from the neutron star associatedwith the LMXB system Cyg X-2 using data from the Insight-Hard X-ray Modulation Telescope (HXMT) and Neutron Star InteriorExplorer (NICER) missions. We focus on identifying cooling trendsin the burst decay phase by modeling burst light curves withexponential decay fits to assess whether the observed bursts exhibitthe expected cooling signatures which is a key indicator ofthermonuclear burning. Additionally, we employ spectral analysisand hardness ratio evolution to characterize burst properties anddifferentiate them from accretion-related variability.
