Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977esasp.124...67c&link_type=abstract
In ESA Recent Advan. in Gamma-Ray Astronomy p 67-73 (SEE N78-11899 02-88)
Astronomy and Astrophysics
Astronomy
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
Scientific paper
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.
Beall J. H.
Crannell Carol J.
Dennis Brian R.
Dolan James F.
Frost Kenneth J.
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