Salyut 4 observations of Cygnus X-1

Details Salyut 4 observations of Cygnus X-1 Salyut 4 observations of Cygnus X-1

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977sval....3...32s&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 3, Feb. 1977, p. 63-67.) Soviet Astronomy Letters, vol. 3, Jan.-Feb. 1977, p. 32-34. Tr

Astronomy and Astrophysics

Astronomy

1

Binary Stars, Black Holes (Astronomy), Spaceborne Astronomy, X Ray Sources, Astronomical Spectroscopy, Salyut Space Station, Spectrum Analysis, X Ray Astronomy

Scientific paper

Results are presented for observations of Cyg X-1 in the energy range from 0.2 to 10 keV with the Filin X-ray spectrometer aboard the Salyut 4 space station. A substantial change in X-ray flux and source spectral characteristics was observed on one day, and this is identified with a transition from a 'dip' to some mean level of the low state of source activity. On another day, the flux had a low mean value, but about 20 powerful X-ray bursts with an average duration of no more than 1 sec were detected for 5 min in the energy range from 2 to 10 keV. These results are evaluated in terms of the source model involving an accreting black hole in a binary system.

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