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Further Radio Observations of Cygnus X-1

1972; Springer Nature; Volume: 235; Issue: 60 Linguagem: Inglês

10.1038/physci235147a0

2058-1106

L. L. E. Braes, G. K. Miley,

Mechanics and Biomechanics Studies

PREVIOUS observations with the NRAO interferometer and the Westerbork synthesis radio telescope have led to the discovery of the radio counterpart of the X-ray source Cyg X-1 (refs. 1 and 2). A near positional coincidence suggested that this radio source is associated with the ninth magnitude B0 Ib star HDE 226868 (AGK2 +35° 1910). Recently, this star was shown to be a spectroscopic binary with a period of 5.60 day, possibly containing a heavy companion3. To study the variability of the Cyg X-1 radio source, we have continued to monitor it with the Westerbork array at 1,415 MHz, and in this communication we present the results.