Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...261..228d&link_type=abstract
Astrophysical Journal, Part 1, vol. 261, Oct. 1, 1982, p. 228-250.
Astronomy and Astrophysics
Astrophysics
32
Binary Stars, Stellar Models, X Ray Sources, Autocorrelation, Background Radiation, Radio Bursts, Sas-3, Shot Noise, Stellar Flares, Stellar Luminosity, X Ray Spectra
Scientific paper
Eight observations of Cir X-1 with SAS 3, each lasting 1-6 days, have yielded a variety of new phenomena, viz., a luminous state of steady emission, rapid large-intensity dips, an extremely rapid X-ray transition, and bright flares. Through searches for periodic X-ray pulsations were carried out on data trains of duration up to 6 days; upper limits for pulsations with periods greater than 250 microsec range down to 0.3%. Aperiodic variability with characteristic times of 0.4-1.0 sec was observed but is not well characterized by a simple shot noise model. No millisecond bursts were observed during 40,000 sec in three separate observations. Spectral parameters derived before and after several X-ray transitions indicate that the transitions are not due to absorption of X-rays by intervening gas. Models previously proposed for the Cir X-1 system do not easily provide explanations for all the complex phenomena reported herein.
Bradt Hale V.
Dower R. G.
Morgan Edward Harrington
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