The orbital inclination of Cygnus XR-1 measured polarimetrically

Details The orbital inclination of Cygnus XR-1 measured polarimetrically The orbital inclination of Cygnus XR-1 measured polarimetrically

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...344..830d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 344, Sept. 15, 1989, p. 830-834.

Astronomy and Astrophysics

Astronomy

34

Black Holes (Astronomy), Light Curve, X Ray Binaries, Cygnus Constellation, Polarimetry, Stellar Mass, Stellar Orbits

Scientific paper

The X-ray binary Cyg XR-1/HDE 226868 was observed polarimetrically over one orbit at three different optical wavelengths. The standard theory of Brown, et al. (1978) is used to derive an orbital inclination i = 62 deg (+5 deg, -37 deg), where the error is the 90-percent-confidence interval derived by the method of Simmons, et al. (1980). The value of the orbital inclination is significantly lower than values based on polarimetric observations. The difference is a result of the observational protocols used. A bias toward larger values of the inclination caused by the tidal distortion of the primary is still found in the present result. The inclination derived corresponds to a mass of the compact component of 6.3 solar masses, above the maximum mass of any degenerate configuration consistent with general relativity except a black hole.

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