The 78.4-day period of Cygnus XR-1

Details The 78.4-day period of Cygnus XR-1 The 78.4-day period of Cygnus XR-1

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.280..126d&link_type=abstract

Nature, vol. 280, July 12, 1979, p. 126, 127.

Astronomy and Astrophysics

Astronomy

2

Astronomical Spectroscopy, Black Holes (Astronomy), X Ray Spectroscopy, X Ray Stars, Optical Polarization, Polarimetry, Power Spectra, Rotation, Ultraviolet Astronomy

Scientific paper

Data from observations of Cyg XR-1 made by the high energy X-ray spectrometer on OSO 8 were analyzed together with previously reported (Dolan, 1977) observations of the polarization of HDE226868 in the U-band in an attempt to detect the 78.8-d modulation reported by Kemp et al. (1977, 1978) in the optical and low-energy X-ray wavelength region. No such modulation was found at the wavelengths studied. It is suggested that if such modulation does exist, it is more likely to be related to the rotation of the free modes of oscillation of the primary than to the existence of a third body in the system.

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