Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ssrv...30..513t&link_type=abstract
(European Space Agency, ESLAB Symposium on X-ray Astronomy, 15th, Amsterdam, Netherlands, June 22-26, 1981.) Space Science Revie
Astronomy and Astrophysics
Astronomy
300
Astronomical Spectroscopy, Exosat Satellite, Lunar Occultation, Proportional Counters, Satellite-Borne Instruments, X Ray Sources, Background Radiation, Cyclotron Radiation, Iron, Line Spectra, Onboard Data Processing, Periodic Variations, Radiant Flux Density, Sulfur
Scientific paper
The Medium Energy Instrument on Exosat, although conceived as the basic instrument of occultations, has been made sufficiently versatile to provide a significant advance over previous large area proportional counters when used for individual source studies of timing and spectra. The energy range is 1.2 to 50 keV, with delta E/E equal to 0.2 at 6 keV; this is sufficient to detect iron lines. The unique facility provided by Exosat, allowing uninterrupted observations of X-ray sources for up to 80 hours and backed up by a high-capacity data link and on-board processing, enables timing studies to be carried out over the range from milliseconds to days. Sophisticated background discrimination techniques producing a rejection efficiency of approximately 99% will control the background count rate to a suitably low value in the environment of the 200,000 km orbit.
Smith Aaron
Turner Martin J. L.
Zimmermann Hans-Ulrich
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