Observations of the Circinus X-1 region

Details Observations of the Circinus X-1 region Observations of the Circinus X-1 region

Jun 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...198..447b&link_type=abstract

Astrophysical Journal, vol. 198, June 1, 1975, pt. 1, p. 447-452.

Astronomy and Astrophysics

Astrophysics

9

Energy Spectra, Stellar Spectra, X Ray Sources, Astronomical Maps, Oso-7, Photons, Spaceborne Telescopes

Scientific paper

The X-ray telescope on board the OSO-7 satellite has provided observations of the Cir X-1 region for over 110 days between December 1971 and March 1973. Although statistically significant fluctuations in the 7- to 11-keV flux were measured, no periodicities in the range between 5 hours and 100 days were found to an upper limit of about 40 percent amplitude. Intensities in the 7- to 57-keV range show variability by a factor of approximately 25 and changes in the spectral shape reflected by a number spectral index varying from about 1.1 to about 3.0. There is a positive correlation between intensity and spectral shape, with a steeper spectrum at times of peak intensity. Although power-law, exponential, and blackbody spectral shapes are equally good fits to these data alone, examination of all the available data appears to rule out a simple blackbody spectrum, at least at times of maximum intensity.

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