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The long term variability of HDE 226868 = Cygnus X-1 (1976)

Liller, W.

In: CASI

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Publication Date: 2006-04-18

Description: Investigation of blue-sensitive photographs of HDE 226868 = Cygnus X-1 reveal no (+ or - 0.06 mag) long-term changes in brightness since the beginning of the century nor any abrupt intensity changes similar to what was observed at X-ray and radio frequencies. From the double sinusoidal fluctuation with 5.6 day period, an attempt is made to derive a more precise value for the orbital period, but problems are encountered and discussed. There exists evidence that the amplitude of the orbital fluctuations is increasing slowly with time.

Keywords: ASTROPHYSICS

Type: NASA. Goddard Space Flight Center X-ray Binaries; p 513-520

Format: text

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