Astronomy and Astrophysics – Astronomy
Scientific paper
May 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975txaw.book.....h&link_type=abstract
Presented at the COSPAR Symp. on Fast Transients in X- and Gamma-rays; Varna, Bulgaria; May 1975
Astronomy and Astrophysics
Astronomy
1
All Sky Photography, Ariel Satellites, Cygnus Constellation, Scorpius Constellation, X Ray Astronomy, Light Curve, Signal To Noise Ratios, X Ray Sources
Scientific paper
Preliminary results from the Ariel-5 all-sky X-ray monitor are presented, along with sufficient experiment details to define the experiment sensitivity. Periodic modulation of the X-ray emission was investigated from three sources with which specific periods were associated, with the results that the 4.8 hour variation from Cyg X-3 was confirmed, a long-term average 5.6 day variation from Cyg X-1 was discovered, and no detectable 0.787 day modulation of Sco X-1 was observed. Consistency of the long-term Sco X-1 emission with a shot-noise model is discussed, wherein the source behavior is shown to be interpretable as approximately 100 flares per day, each with a duration of several hours. A sudden increase in the Cyg X-1 intensity by almost a factor of three on 22 April 1975 is reported, after 5 months of relative source constancy. The light curve of a bright nova-like transient source in Triangulum is presented, and compared with previously observed transient sources. Preliminary evidence for the existence of X-ray bursts with duration less than 1 hour is offered.
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