Wind Accretion and State Transitions in the Black Hole Binary Cyg X-1

Details Wind Accretion and State Transitions in the Black Hole Binary Cyg X-1 Wind Accretion and State Transitions in the Black Hole Binary Cyg X-1

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9646g&link_type=abstract

HST Proposal ID #9646

Physics

Hst Proposal Id #9646

Scientific paper

The black hole binary, Cyg X-1, is now {May 2002} in the high/soft X-ray state, the first one to occur since 1996. Models predict that this state corresponds to a high mass transfer phase in the binary, but several lines of observational evidence cast doubt on this assumption. The best test of this hypothesis is to observe the UV P Cygni lines of the supergiant that are formed in its wind outflow. We propose to obtain the first ever high resolution UV spectra of the system using STIS to determine {1} the mass loss rate and the dynamical {density and velocity} structure of the wind of the supergiant star in both X-ray states, and {2} how the X-ray source ionizes the wind. These spectra will be useful for many investigations and will form an important resource for many in the research community.

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