The 4.8 hour modulation of Cyg X-3
1979; Oxford University Press; Volume: 189; Issue: 1 Linguagem: Inglês
10.1093/mnras/189.1.9p
ISSN1365-2966
Autores Tópico(s)High-pressure geophysics and materials
ResumoThe relatively high rate of change of the 4.8-hr modulation period of Cyg X-3 reported in the literature |$(\dot{P}/P\sim 5 \times {10}^{-6}\,\text{yr}^{-1})$| is not confirmed by X-ray observations taken with the Copernicus satellite over an interval of seven years. Using the Copernicus data, we find a 3 a upper limit to |$\dot{P}/P\,\text{of} \,7 \times {10}^{-7}\text{yr}^{-1}$| between 1972 and 1978. This result removes the bias towards high mass loss binary models of Cyg X-3 implied by the previously reported positive detections of a period derivative. However, accretion onto a compact star remains a viable explanation for the origin of the X-ray flux.
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