On the puzzling nature of the X-ray binary Circinus X-1

Details On the puzzling nature of the X-ray binary Circinus X-1 On the puzzling nature of the X-ray binary Circinus X-1

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.253..212s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 253, Nov. 15, 1991, p. 212-216.

Astronomy and Astrophysics

Astronomy

38

Radio Emission, Stellar Flares, X Ray Binaries, Radio Astronomy, Stellar Luminosity

Scientific paper

During 1989 March 30 to April 2, Circinus X-1 was monitored at 5 GHz by one or other of a pair of two-element Australia Telescope interferometers and the Hartebeesthoek antenna, South Africa, and by the Ginga satellite in the 1-37 keV energy range. The observations show that Cir X-1 now has a very low level of radio emission, unlike the late 1970s and early 1980s, during which intense flare activity often occurred near zero orbital phase. Also, the X-ray behavior is strange in that it does now show the usual spectral states seen in low-mass X-ray binaries, yet exceeds the Eddington limit during flaring episodes.

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