Cygnus X-1/HDE 226868 - Long-term circular polarization variability

Details Cygnus X-1/HDE 226868 - Long-term circular polarization variability Cygnus X-1/HDE 226868 - Long-term circular polarization variability

Oct 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...225..599m&link_type=abstract

Astrophysical Journal, Part 1, vol. 225, Oct. 15, 1978, p. 599-602. Research supported by the Battelle Memorial Institute.

Astronomy and Astrophysics

Astronomy

2

Binary Stars, Circular Polarization, X Ray Astronomy, X Ray Stars, Astronomical Photometry, Polarimetry, Stellar Magnetic Fields, Stellar Models

Scientific paper

The first two years of observations of the Cyg X-1/HDE 226868 system are reviewed, and results are reported for recent measurements of the system's blue (centered at 4500 A) circular and linear polarization. The recent polarization results indicate a real change in time-averaged circular polarization at the 4.2-sigma confidence level but no significant variation in either circular or linear polarization. A qualitative model of the system is outlined which tentatively attributes the long-term pattern changes in both circular polarization and X-ray flux to changing disk structure about the degenerate source. Evidence supporting a correlation between X-ray photometry and circular polarimetry is discussed.

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