Power spectra of quasi-periodic oscillations in luminous X-ray stars

摘要: A variety of partial random processes are considered in order to study the effects on power-density spectrum several physical phenomena that may occur beat-frequency modulated accretion (BFMA) model QPOs. The relevant properties BFMA summarized, and class used represent X-ray intensity time series predicted by introduced. dependence pulse shape is discussed. Pulse-lifetime orbital-frequency distributions introduced, illustrating how these affect spectrum. effect nonuniform initial-pulse phase pulse-time considered. a particular type pulse-to-pulse correlation be natural context greatly increases power oscillations relative red noise analyzed. 52 references.