Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976ap%26ss..42..111c&link_type=abstract
(COSPAR, Symposium on Fast Transients in X- and Gamma-Rays, Varna, Bulgaria, May 29-31, 1975.) Astrophysics and Space Science, v
Astronomy and Astrophysics
Astronomy
4
Oso-7, X Ray Astronomy, X Ray Sources, Active Galaxies, Cosmic X Rays, Crab Nebula, Galactic Radiation, Novae, Pulsars, Radiant Flux Density, Radio Stars, Supernovae, X Ray Spectra
Scientific paper
A variety of transient X-ray phenomena have been studied. Data from the OSO-7 satellite reveal both long and short time-scale transients. Extensive observations have been made of the Lupus X-ray Nova (3U1543-47) and GX339-4(MX 1658-48) which may represent a very different type of transient source. A unique, intense X-ray flare lasting ten minutes was also recorded, and the X-ray emission from the active galaxy Cen A was found to vary significantly over a period of several days. In a recent balloon flight the Crab pulsar, NP0532, was observed to exhibit a transient pulsed component distinct from the usual main pulse and interpulse. A sounding-rocket experiment detected an ultrasoft transient X-ray source tentatively associated with SS Cygni, and preliminary results from SAS-3 show a very hard spectrum for the new source A0535 + 26. On the other hand, extensive OSO-7 null observations of both Type I and II supernovae and of the flaring radio star Algol make it unlikely that these types of objects are potent transient X-ray emitters.
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