X-ray observations of Circinus X-1 in its low state

Details X-ray observations of Circinus X-1 in its low state X-ray observations of Circinus X-1 in its low state

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.200.1025c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 200, Sept. 1982, p. 1025-1031. Research supported by the Science Resear

Astronomy and Astrophysics

Astronomy

6

Light Curve, Minima, Periodic Variations, Radiant Flux Density, Stellar Spectrophotometry, X Ray Sources, Ariel 5 Satellite, Astronomical Models, Iron, Photons, Spectral Energy Distribution, Spectrum Analysis, Stellar Winds, X Ray Absorption, X Ray Astronomy

Scientific paper

Ariel V experiment C repeatedly observed Cir X-1 in the low-intensity portion of its 16.6-day light curve. The spectrum of the source is found to be a power law with photon spectral index of about 2.3-3.0 and hydrogen column density of about 10 to the 22nd/cu cm. A weak iron feature may be present. The observation of such a low column density for the low-intensity state runs counter to previous assumptions; the significance of this observation for the current model of the source, in which the modulation is explained by absorption of X-rays in the primary's stellar wind, is discussed. A spectrum of 4U1510-59, in the same field as Cir X-1, is also reported.

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