X-ray observations of AM Herculis from OSO 8

Details X-ray observations of AM Herculis from OSO 8 X-ray observations of AM Herculis from OSO 8

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.279..509c&link_type=abstract

Nature, vol. 279, June 7, 1979, p. 509, 510.

Astronomy and Astrophysics

Astronomy

4

Binary Stars, White Dwarf Stars, X Ray Spectra, Ariel 5 Satellite, Balloon-Borne Instruments, Oso-8, Satellite-Borne Instruments, Scintillation Counters, Stellar Magnetic Fields, X Ray Astronomy

Scientific paper

X-ray observations of the white dwarf binary system AM Herculis in the range 2 to 250 keV, taken by OSO 8, are presented and compared with balloon and Ariel 5 measurements. The composite spectrum of the 2 to 40 and 20 to 250 keV fluxes determined by the proportional counter and the high energy scintillation spectrometer, respectively, on board the satellite is shown averaged over the entire binary cycle. Variations in spectral shape and intensity between the OSO 8 results and balloon measurements taken 10 to 20 days apart are observed. Results indicate the presence of a spectral break at about 15 keV on some occasions, similar to that seen in Her X-1, however presumably caused by a different mechanism than in the neutron star. It is also considered unlikely that the gamma-ray tail observed by Ariel 5 existed during OSO 8 observations.

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