2012/13-observation of the HeI6678 radial velocity
The attached upper plot shows the observed orbital behavior of the well-known 132.9735d-period [1, 2, 3], the lower plot shows the phase characteristic.
Observer of the campaign 2012/13: C. Sawicki, St. Charbonnel, B. Mauclaire, E. Pollmann.
The determined 132.4995d-period confirms all the values of [1,2,3], inspite of the historical disk minimum during our campaign.
The relatively large RV scatter could be caused by ultra-short-term variations, due to co-rotating clouds and/or non-radial pulsations of the primary.
 Ruzdjak, D., et al., A&A, 506, 1319-1333, 2009
 Harmanec, P. ,1984, Bull. Astron. Inst. Czech., 35, 164
 Pollmann, E., Mauclaire, B., Bücke, R., IBVS 6099