Observations of Celestial X-Ray Sources above 20 keV with the High-Energy Scintillation Spectrometer on Board OSO-8
Abstract
High-energy X-ray spectra of the Crab Nebula, Cyg XR-1, and Cen A were determined from observations with the scintillation spectrometer onboard the OSO-8 satellite, launched in June 1975. Each of these sources was observed over two periods of 8 days or more, allowing a search for day-to-day and year-to-year variations in the spectral and temporal characteristics of the X-ray emission. No variation in the light curve of the Crab pulsar was found from observations which span a 15-day period in March 1976, with demonstrable phase stability. Transitions associated with the binary phase of Cyg XR-1 and a large change in the emission from Cen A are reported.
- Publication:
-
Recent Advances in Gamma-Ray Astronomy
- Pub Date:
- July 1977
- Bibcode:
- 1977ESASP.124...67C
- Keywords:
-
- Oso-8;
- Satellite-Borne Instruments;
- Scintillation Counters;
- Spectrometers;
- X Ray Sources;
- Binary Stars;
- Centaurus Constellation;
- Crab Nebula;
- Cygnus Constellation;
- Pulsars;
- Satellite Observation;
- X Ray Spectra;
- Space Radiation