We present sub‐second fast photometry for the high mass X‐ray binary Cygnus X‐1. We try to observe variability due to instabilities in the accretion process at optical wavelengths. The observations were carried out using the high speed AstraLux camera at the Calar Alto 2.2 m telescope, Spain, in November 2006 and August 2007. We report that the Cygnus X‐1 system light curve sampled every 30 milli‐second did not display strong enough evidence of any periodic component related to the source.
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© 2008 American Institute of Physics.
2008
American Institute of Physics
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