Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975natur.256..107h&link_type=abstract
Nature, vol. 256, July 10, 1975, p. 107, 108. NASA-supported research.
Astronomy and Astrophysics
Astronomy
27
Light Curve, Spaceborne Astronomy, Stellar Radiation, X Ray Astronomy, X Ray Stars, Astronomical Netherlands Satellite, Binary Stars, Interstellar Extinction, Satellite Observation
Scientific paper
The equipment, method and results of the measurements performed with soft and hard X-ray detectors of the Space Research Laboratory in Utrecht and the Center for Astrophysics in Cambridge, Mass., are described. Cyg X-1 underwent an upward transition in its intensity, that seems to be the inverse of the downward transition seen by Uhuru in April 1971. The bulk of the increase, as observed by the Astronomical Netherlands Satellite instruments, from May 1 to May 8, 1975, occurs at low energy: between 1 and 2 keV, the intensity increased by a factor of 10 over the November 1974 intensity, while above 8 keV there is no significant change. The data suggest that Cyg X-1 has reverted to its high state.
Brinkman Albert C.
den Boggende A.
Grindlay Jonathan
Gronenschild E.
Heise Jaret
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