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We have investigated temporal and spectral properties of a large sample ofthermonuclear bursts with oscillations from eight different sources with spinfrequencies varying from 270 to 620 Hz. For our sample we chose those bursts,for which the oscillation is sufficiently strong and of relatively longduration. The emission from the hot-spot that is formed during a thermonuclearburst is modulated by several physical processes and the burst oscillationprofiles unavoidably carry signatures of these. In order to probe thesemechanisms, we examined the amplitude and phase lags of the burst oscillationswith energy. We also studied the frequency variation of oscillations duringthese thermonuclear bursts. We observed that the frequency drifts are morefrequent in the cases where the spin frequency is lower. We found that thephase lag of the burst oscillations shows no systematic evolution with energybetween the bursts, and also in between different sources. In 7 cases, we doindeed observe lag of soft energy photons, while there are a significant numberof cases for which hard lag or no lag is observed.

Time and energy dependent characteristics of Thermonuclear burst oscillations