Abstract
Polarimetric observations of close binaries may reveal the presence of a black-hole secondary. The Einstein photometric effect will introduce a characteristic, time-varying signature upon the interstellar polarization. For several reasons, it is concluded that the short time-scale variability in the polarization in HDE 226868 is caused by Rayleigh scattering from gas streams known to exist in the system. X Persei may have a variable polarization consistent with the predicted effect.
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Dolan, J.F. The optical polarization of X-ray binaries. Astrophys Space Sci 52, 201–211 (1977). https://doi.org/10.1007/BF00647164
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DOI: https://doi.org/10.1007/BF00647164