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astro-ph1997
Cygnus X-1: A Spinning Black Hole?
Wei Cui, Wan Chen, S. N. Zhang
It has been a long-standing puzzle what triggers the spectral transition between the hard and soft states in Cyg X-1. Also, the origin of the frequently observed X-ray flares in th…
astro-ph1997
Cygnus X-1: X-ray Emission Mechanism and Geometry
Wei Cui, S. N. Zhang, J. H. Swank +3
We summarize recent observations of Cyg X-1 during its 1996 state transition. The results favor an emission geometry with a central optically thin corona surrounded by an optically…
astro-ph1997
Long-Term Variability in Bright Hard X-ray Sources: 5+ Years of BATSE Data
C. R. Robinson, B. A. Harmon, M. L. McCollough +6
The operation of CGRO/BATSE continues to produce, after more than 5 years, a valuable database for the study of long-term variability in bright hard X-ray sources. The all-sky capa…