Black Hole Selected X-ray Binary Cyg X-1 Of The Light Curve

This paper is contributed to the study of the light curve and periodicity of the black hole X-ray binary Cyg X-1.Black hole is the high-mass compact object, which is result of the gravity collapse of the star and most of the black hole system is X-ray nova. Up to the date, we have observed 18 black hole X-ray binary. It is very significant to study the evolution and the radiation mechanism of the black hole binaries throughing studying their light curve. Moreover, it is a very important method with study black hole states and the periodicity of the light curve to study their physical process.The states of the black hole binaries generally consist of low-hard state, high-soft sate and quiescent state. Hard state: the luminosity is very low, the power law radiation is domained and the hard photon is mainly produced with bremsstrahlung in the corona. Soft state: the luminosity is very high, the thermal radiation is domained and the soft photon is mainly produced with black body radiation is the accretion disk. Quiescent state: the luminosity is very weak and the power law radiation is domained.In the paper, we mainly study the light curve periodicity of the fist black hole binary Cyg X-1. We wish that we can deal the object periodicity with a simple mathematics concept: for a periodicity function F(x), whose derivation must also be a periodicity function with asame period. Furthermore, we also analysis the periodicity of the Cyg X-1 with the classical method: Fast Fourier Transition and Folding Feriod , and we obtained the reasonable result.