AAS Meeting #193 - Austin, Texas, January 1999
Session 43. RXTE, XTE and X-Ray Sources
Display, Thursday, January 7, 1999, 9:20am-6:30pm, Exhibits Hall 1

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[43.05] Cyg X-1 spectral variability observed with RXTE and BATSE/CGRO

X. Sun (USRA/NASA/MSFC and CAS/BAO), S. N. Zhang (UAH and NASA/MSFC), K. Ebisawa (USRA and NASA/GSFC), B. A. Harmon (NASA/MSFC)

Hard X-ray spectral variability is important for understanding the high energy emission mechanism in X-ray binary black hole candidates. The canonical black hole candidate Cyg X-1 was observed extensively in various states with RXTE and CGRO/BATSE. We report our analysis of Cyg X-1 hard X-ray spectral variations during these observations, with special attention to the correlations between the power-law index, the power-law cutoff energy, the reflection component, and the hard X-ray flux in various intensity states.

The author(s) of this abstract have provided an email address for comments about the abstract: xuejun.sun@msfc.nasa.gov

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