Abstract
Cygnus XR-1 was observed Nov. 11 to 18, 1975, in the energy range 20 to 400 keV with a CsI scintillation crystal spectrometer on board the OSO-8 satellite. A drop in the count rate of ~45% between 23 and 153 keV was observed to occur gradually over a full day on Nov. 16. Comparison with 2 to 7 keV proportional counter data taken simultaneously on OSO-8 by P. Serlemitsos et al. (private communication), the count rate of which rose ~40% on Nov. 16, shows the 23 to 153 count rate to be generally anti-correlated with the 2 to 7 keV count rate over the entire 8 days of observation (Fig. 1). The observations are in agreement with the predictions of the two-temperature accretion disk model of Shapiro, Lightman and Eardley (Astrophys. J., 204, 187, 1976).
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© 1977 IAU
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Dolan, J.F., Dennis, B.R., Crannell, C.J., Frost, K.J., Orwig, L.E. (1977). OSO-8 Observations of Cygnus XR-1. In: Müller, E.A. (eds) Highlights of Astronomy. International Astronomical Union / Union Astronomique Internationale, vol 4-1. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-1248-5_7
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DOI: https://doi.org/10.1007/978-94-010-1248-5_7
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