J. C. Kemp, Department of Physics, University of Oregon, reports that observations (on 160 nights between Sept. 1974 and Mar. 1977) of the variable ultraviolet polarization of HDE 226868 reveal a predominant period of 39.15 +/- 0.40 days, with a minimum on 1977 Feb. 25.6 UT. The peak-to-peak amplitude of the polarization variation is 0.40 percent, which is considerably larger than the coherent variation on the normal 5.6-day orbital period. The statistical significance of the 39-day variation is over 99 percent. It should be noted that the predominant period as detected by other means (e.g., radial velocities) might be 78 days, rather than 39.
International Astronomical Union Circular
- Pub Date:
- April 1977