Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...264..237k&link_type=abstract
Astrophysical Journal, Part 1, vol. 264, Jan. 1, 1983, p. 237-250. NASA-supported research
Astronomy and Astrophysics
Astrophysics
16
Binary Stars, Optical Polarization, X Ray Sources, X Ray Stars, Harmonics, Interstellar Radiation, Power Spectra, Radial Velocity, Variability
Scientific paper
Observations of periodicities in the optical polarization of the weak X-ray source X Persei are reported. Polarization was measured in the V band 400 times over the course of 356 nights during 1977-1982. The Q and U Stokes parameters derived from the measurements show a definite variability with a typical amplitude of 0.1%, which is strongest at periods greater than 100 days. In particular, a strong peak is observed with a period of 297 days, consistent with the second-harmonic component of the known 580-day radial velocity cycle. A component with 590-day periodicity is not ruled out by the observations, although it was not detected. Observations imply the 580-day period to be an effect of orbital or rotational processes, with the corotating scattering body either close to the light source or very large in extent, and a system inclination close to 80 deg.
Barbour M. S.
Kemp James C.
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