Discovery of synchronous binary polarization in Cygnus X-1

Details Discovery of synchronous binary polarization in Cygnus X-1 Discovery of synchronous binary polarization in Cygnus X-1

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...220l.123k&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 220, Mar. 15, 1978, p. L123-L126.

Astronomy and Astrophysics

Astrophysics

29

Binary Stars, Optical Polarization, Periodic Variations, Polarimetry, Ubv Spectra, X Ray Stars, Power Spectra, Stellar Spectrophotometry

Scientific paper

Using 180 nights of data from 1975 and 1977, we have found a stable polarization variation in the V band which is periodic on the orbital cycle of 5.600 d. The peak-to-peak amplitude is 0.25% and is largely in the position-angle Stokes parameter. The amplitude in the ultraviolet is much smaller. The V-band polarization curves suggest a surprisingly large inclination; the single-scattering model gives i = (76 plus or minus 8 degrees). We also summarize our recent photometry

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