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Abstract
Stellar companion of a black hole orbiting in an eccentric orbit will experience modulating
tidal force with a periodicity same as that of the orbital period. This, in turn,
would modulate accretion rates, and the seed photon flux which are inverse Comptonized
to produce harder X-rays. By analyzing complete all sky monitor (ASM) data (1.5-12
keV) of RXTE and all sky survey data (15-50 keV) of Swift/BAT we discover this periodicity
in several objects. We also estimate eccentricities from the RMS power of the peak
around quasi-orbital periods (QOP). Our method provides an independent way to obtain
time periods and eccentricities of such compact binaries.