The study of the light curve of X-ray binary Cyg X-1

Details The study of the light curve of X-ray binary Cyg X-1 The study of the light curve of X-ray binary Cyg X-1

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006acasn..47..231d&link_type=abstract

Acta Astronomica Sinica, vol. 47, no. 3, p. 231-246

Physics

1

X-Rays: Binaries, X-Rays: Individuals: Cyg X-1, Black Hole Physics

Scientific paper

We examine the data of Cyg X-1 from January 1996 to May 2005 observed by Rossi X-Ray Timing Explore (RXTE) satellite. Using a new method (Derivative method), we find out two interesting periods (e.g., T~1.0±0.2day and T~18.0±3.0day). In hard state, two periods appear together, while in soft state only T~ 1.0±0.2day's period exists. For testing the reliability of new method, we also analysis the data with two commonly used methods (e.g., Fast Fourier Transform and Period Folding), and obtain the same results. In the paper, we also search the orbital period of Cyg X-1 using new method and find that T = 5.6day's orbital period exists both in hard state and in soft state, though the orbital period appears more evident in hard state than in soft state.

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