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OSO-8 Observations of Cygnus XR-1

Published online by Cambridge University Press:  30 March 2016

J.F. Dolan ,
B.R. Dennis ,
C.J. Crannell ,
K.J. Frost  and
L.E. Orwig
J.F. Dolan
Affiliation:
NASA-Goddard Space Flight Center, Greenbelt, MD., USA
B.R. Dennis
Affiliation:
NASA-Goddard Space Flight Center, Greenbelt, MD., USA
C.J. Crannell
Affiliation:
NASA-Goddard Space Flight Center, Greenbelt, MD., USA
K.J. Frost
Affiliation:
NASA-Goddard Space Flight Center, Greenbelt, MD., USA
L.E. Orwig
Affiliation:
NASA-Goddard Space Flight Center, Greenbelt, MD., USA

Extract

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Cygnus XR-1 was observed Nov. 11 to 18, 1975, in the energy range 20 to 400 keV with a Cgl 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).

Type
Joint Dicussions
Information
Highlights of Astronomy , Volume 4 , Issue 1: Highlights of Astronomy. As presented at the XVIth General Assembly of the IAU, 1976 (Part I) , 1977 , pp. 99 - 100
Copyright
Copyright © Reidel 1977