HEAD 2008

10th Meeting of the High Energy Astrophysics Division
Los Angeles (CA), USA
2008 March 31st – April 3rd

Chandra Gratings Observations of the Focused Wind in Cygnus X-1/HDE 226868

M. Hanke, J. Wilms, M.A. Nowak, K. Pottschmidt, N.S. Schulz, J.C. Lee, J. Xiang, A. Juett

ADS We present results from a 50ksec observation of the hard state of the supergiant X-ray binary system Cygnus X-1/HDE 226868 with Chandra's High Energy Transmission Grating Spectrometer and simultaneous RXTE data. Performed during superior conjunction of the black hole, the observation is ideally suited for spectroscopy of the focused stellar wind in the system. A large number of absorption lines is detected in the X-ray spectrum.

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